This week, we step outside the usual world of homes, schools, and offices to ask a question that might reshape how we think about the hospitality industry: What if the physical performance of a hotel room matters just as much as the quality of service—and what if guests are already telling us this in their online reviews?

The paper is titled The Impact of Indoor Environmental Quality on Tourist Accommodation Ratings Using Guest Reviews, published in the Journal of Building and Environment. It's authored by Fan Zhang and colleagues from Griffith University, the University of New South Wales, and several other international institutions. Using web mining and artificial intelligence, they analyzed over half a million Booking.com reviews from Australian hotels and serviced apartments to understand how indoor environmental quality—air quality, acoustics, thermal comfort, lighting—actually drives guest satisfaction and ratings.

Traditionally, measuring occupant satisfaction in hotels has been nearly impossible. Post-occupancy evaluations require structured surveys, but try getting a business traveler rushing to the airport at 6am to fill in a 20-page questionnaire about ventilation rates. It's just not going to happen. So instead, these researchers used natural language processing to extract the actual, unprompted words from guests who stayed in these places—to see exactly what they care about.

Key Topics Discussed:

• Three Factor Theory: A framework that categorizes any product or service feature into three buckets: basic factors (dissatisfiers), performance factors (the better it is, the happier you are), and excitement factors (unexpected bonuses). Almost all indoor environmental quality factors function as basic factors—guests expect them to be good, and if they're not, ratings plummet.

• The Big Three Failures: Poor cleanliness, poor indoor air quality, and bad acoustics were the specific failures that dragged accommodation ratings down the most. Stuffy rooms, musty smells, and hearing the elevator rattling through the walls all night are directly torching hotel revenues by driving down public ratings.

• Indoor Environmental Quality Accounts for 33% of Guest Ratings: In budget hotels, nearly a third of a customer's overall rating is driven by indoor environmental quality. In luxury accommodation, it's still about 24%. You can have the best marketing team and the friendliest staff, but if your building is fundamentally underventilated, your business will suffer.

• The COVID Effect: The pandemic drastically amplified our sensitivity to poor indoor environments. During COVID, the negative impact of poor indoor air quality and cleanliness on guest ratings got significantly stronger. People suddenly equated visible cleanliness and fresh air with their own personal safety and survival.

• The View Exception: In budget accommodation, a nice view was an excitement factor—people didn't expect it, so when they got one, they were thrilled. But in luxury hotels, the view reverted to being a basic factor. If you're paying 5-star prices, you expect 5-star views.

• The Case for IEQ Benchmarking: The researchers suggest that policymakers and industry leaders should implement formal indoor environmental quality benchmarking for hotels—similar to Australia's NABERS rating for office buildings. Imagine being able to check a hotel's certified ventilation and air quality rating before you even book a room.

The Impact of Indoor Environmental Quality on Tourist Accommodation Ratings Using Guest Reviews

https://doi.org/10.1016/j.buildenv.2025.113135

The One Take Podcast in Partnership with

SafeTraces (https://www.safetraces.com/) and Inbiot (https://www.inbiot.es/?utm_campaign=simon&utm_source=airqualitymatters&utm_medium=podcast)

Do check them out in the links and on the Air Quality Matters Website (https://www.airqualitymatters.net/podcast)

Chapters

• 00:00:00 Introduction: The Overlooked Environment of Hotels
• 00:01:21 The Hospitality Blind Spot: Service vs Environment
• 00:01:52 The POE Problem: Why Traditional Surveys Fail in Hotels
• 00:02:24 The AI Solution: Mining Half a Million Guest Reviews
• 00:02:56 Three Factor Theory: The Framework for Understanding Buildings
• 00:04:06 The Eye-Opening Results: IEQ as a Basic Factor
• 00:05:03 The Triple Threat: Cleanliness, Air Quality, and Acoustics
• 00:05:44 The View Exception: Budget Thrills vs Luxury Expectations
• 00:06:30 The COVID Effect: When Air Quality Became Survival
• 00:07:53 The Bottom Line: IEQ Accounts for 33 Percent of Hotel Ratings
• 00:08:37 The Future: IEQ Benchmarking and Certification for Hotels
• 00:09:18 Study Limitations and the Reality of Guest Perception
• 00:09:55 The Main Takeaway: Engineering as Front-Line Business Survival

This week, we sit down with Adam Muggleton, Chief Technical Officer at AESG and host of the Edifice Complex Podcast.

Adam's career spans project management, property development, and commissioning across 21 countries—from the UK to the Middle East and North America. He views buildings not as architectural statements, but as complex machines that are likely underperforming. With decades of experience and zero patience for performative sustainability, he has developed a reputation for dismantling corporate jargon and shining a light on poor engineering and mediocre outcomes in the construction industry.

His relentless focus is on commissioning and building performance. He doesn't just want to know if a building looks good at sunset—he wants to know if the HVAC actually works, if the air is healthy, and why the industry persists in delivering glorified caves with modern price tags. Beneath his sceptical, no-nonsense exterior lies a deep advocacy for human-centric design, driven by the belief that the only way to fix the construction industrial complex is through radical transparency, rigorous testing, and a refusal to accept average as the industry standard.

Key Topics Discussed:

• The Commissioning Accident: How Adam fell into commissioning engineering by accident—and why commissioning is always an accident. No one wakes up at 16 and says they want to be a commissioning engineer. Yet it's one of the most critical roles in delivering functional buildings.

• The Consequences Problem: Why the construction industry is the only industry in the world where you can send out a set of documents riddled with errors and omissions—and not pay for those mistakes. Why there are no real consequences for poor delivery, and how that shapes everything from design to handover.

• Humans at the Centre of Buildings—A Waste of Time? A brutally honest discussion about whether the rhetoric of "humans at the center" actually matters when residential developers are at the bottom of the care chain, and the only real feedback that matters is whether people stop buying.

• The Elon Musk Question: Who is the Elon Musk of the built environment? Who is innovating, crushing it, doing the impossible? And why Adam's daughter and her engineering friends would rather flip burgers than work in the built environment.

• The Platinum Building Paradox: Why even high-performance buildings with all the badges can fail spectacularly—like a healthy buildings conference held in a room where everyone is sitting in a fog of their own breath because the ventilation can't handle 80 people.

GUEST:

Adam Muggleton - Chief Technical Officer, AESG | Host, Edifice Complex Podcast

https://www.linkedin.com/in/buildingwhisperer/

https://aesg.com/uk/

https://creators.spotify.com/pod/profile/edifice-complex-podcast2

The Air Quality Matters Podcast in Partnership with

Particles Plus https://particlesplus.com/

Farmwood (https://farmwood.co.uk/) - Eurovent (https://www.eurovent.eu/) - Aico (https://www.aico.co.uk/) - Ultra Protect (https://www.ultra-protect.co.uk/air-quality-matters)

The One Take Podcast in Partnership with

SafeTraces (https://www.safetraces.com/) and Inbiot (https://www.inbiot.es/?utm_campaign=simon&utm_source=airqualitymatters&utm_medium=podcast)

Do check them out in the links and on the Air Quality Matters Website. (https://www.airqualitymatters.net/podcast)

If you haven't checked out the YouTube channel its here (https://www.youtube.com/@airqualitymatters-SimonJones). Do subscribe if you can, lots more content is coming soon.

Chapters

• 00:00:00 Introduction: The Accidental Commissioning Engineer
• 00:03:18 The Property Development Perspective: When Commissioning Becomes an Afterthought
• 00:04:50 The Consequence Problem: Why Construction Keeps Making the Same Mistakes
• 00:06:27 The Complexity Trap: Why Buildings Are So Difficult to Get Right
• 00:09:47 The Defects Dilemma: Cars vs Buildings and the Zero Defects Dream
• 00:10:51 The R&D Desert: Why Construction Firms Don't Invest in Innovation
• 00:15:49 The Building Hierarchy: Who Gets Good Air and Who Doesn't
• 00:19:09 The Human-Centric Building Myth: Why Residential Is at the Bottom
• 00:32:24 Breaking the Cycle: Commissioning as a Compliance Tool
• 00:51:19 The Supply Chain Reality: Who Really Designs Your Building
• 01:05:05 The Elon Musk Question: Where's the Innovation in Construction?
• 01:13:44 The Platinum Plaque Problem: High-Performance Buildings That Don't Perform
• 01:17:34 The Visibility Solution: Open Source Performance Data and Property Tax Penalties
• 01:20:41 The Housing Crisis: Why Government Must Get Back in the Game
• 01:37:35 The Optimistic Conclusion: Why Construction Is Still a Great Career

This week, we tackle a question that goes to the heart of the performance gap in buildings: What if the problem isn't just poor construction or shoddy installation—but the data we're feeding into our models in the first place?

There's an old saying in computer science: garbage in, garbage out. If you feed a perfect model with bad assumptions, you get a perfect calculation of a fantasy. And that's exactly what's been happening in indoor air quality modeling for decades. We've been relying on scattered, outdated, inconsistent emission rate data—pulled from 1990s conference papers, paywalled journals, and PDF reports buried in the internet—and wondering why our buildings don't perform as predicted.

The paper is titled Pandora: An Open Access Database of Indoor Pollutant Emission Rates for Indoor Air Quality Modeling, published in the Journal of Building Engineering. It's the work of a huge international team, including Mark Adobati and colleagues from Annex 86, and it represents a massive effort to clean up the mess of data that indoor air quality modelers have been struggling with for years.

Key Topics Discussed:

• The Data Problem: Why finding reliable emission rates for indoor pollutants has been a nightmare—scattered across thousands of sources, often in the wrong units, measured under weird conditions, and completely inconsistent.

• What Pandora Is: An open access, web-based database systematically compiling nearly 10,000 specific emission rates from the scientific literature, categorizing 740 different pollution sources—from paints and carpets to cleaning products, furniture, and even human beings.

• The Shocking Case Study: A simple child's bedroom modeled three different ways using data from Pandora. The total formaldehyde emission rate ranged from 342 micrograms per hour to over 6,000 micrograms per hour—a factor of 20 difference. If you designed ventilation based on the lower number, a trickle vent might be fine. Based on the higher number, you'd be installing industrial extraction.

• Why the Huge Discrepancy: The database contains data going back to the 1980s, when building materials were dirty—paints full of solvents, glues full of formaldehyde. Regulations like the French VOC label and German AGBB standard have forced manufacturers to clean up their act. If you use a statistical average of all data ever published, you're skewing your model with dirty data from 1995, predicting a problem that might not exist anymore.

• The Recommendation: Use the 25th percentile of the data for things like formaldehyde. This lower value is likely a much more accurate representation of modern, regulation-compliant materials. We might be systematically overestimating the chemical load from building materials if we rely on older datasets.

Pandora: An Open Access Database of Indoor Pollutant Emission Rates for Indoor Air Quality Modeling

https://doi.org/10.1016/j.jobe.2025.114216

Pandora Database: https://db-pandora.univ-lr.fr/

The One Take Podcast in Partnership with

SafeTraces (https://www.safetraces.com/) and Inbiot (https://www.inbiot.es/?utm_campaign=simon&utm_source=airqualitymatters&utm_medium=podcast)

Do check them out in the links and on the Air Quality Matters Website (https://www.airqualitymatters.net/podcast)

Chapters

• 00:00:00 Introduction: The Data We Rely On
• 00:01:06 Garbage In, Garbage Out: The Input Data Problem
• 00:01:45 Introducing Pandora: A Massive Data Compilation Effort
• 00:02:27 The Scattered Data Nightmare: Why We Needed This
• 00:03:08 What's Inside: Construction Materials Dominate the Database
• 00:03:43 The Overlooked Sources: Cleaning Products and Human Pollution
• 00:04:34 The Case Study: A Child's Bedroom Reveals a Shocking Problem
• 00:05:41 The 20X Problem: Why Data Selection Method Matters Enormously
• 00:06:06 The Time Trap: Old Dirty Data Versus Modern Clean Materials
• 00:06:43 The Recommendation: Use the 25th Percentile for Modern Materials
• 00:07:03 The So What: We Might Be Solving Problems That Don't Exist Anymore
• 00:07:27 The New Risks: Recreational Chemicals and Activity-Based Pollution
• 00:08:17 The Living Project: Pandora Needs to Grow and Evolve
• 00:08:38 The Path Forward: From Guessing to Engineering Precision
• 00:08:59 Closing: Transparency and Understanding the Invisible Cloud

This week, we step into the world of moisture in buildings—one of the most overlooked yet critical aspects of indoor air quality and building performance. While we talk about humidity constantly, we rarely stop to break down what we actually mean. What is moisture? Is it a pollutant? And why does it matter so much?

We sit down with David Schurk, owner of HVAC Insight Consultants and a dehumidification specialist with over 40 years of experience in the HVAC industry. David has led system design, application engineering, and field implementation efforts across healthcare, aerospace, industrial, and mission-critical environments. He's an ASHRAE life member and distinguished lecturer, and a course developer and instructor for multiple ASHRAE Learning Institute professional development programs.

Key Topics Discussed:

• Is Moisture a Pollutant? How humidity impacts human comfort, building integrity, and health. Why 30% of the way we regulate our body temperature relies on evaporative cooling—and what happens when high humidity impedes that process.

• The Operating Room Problem: A vivid real-world example of how high humidity in hospital operating rooms causes surgeons to overheat, insist on colder temperatures, which paradoxically increases relative humidity further—creating condensation, discomfort, and potentially dangerous conditions.

• Breaking Down the Terminology: Dry bulb temperature, wet bulb temperature, relative humidity, absolute humidity, vapor pressure, dew point temperature—what do these terms actually mean? How do they interact? And why does relative humidity confuse everyone?

• The Psychrometric Chart: The beautiful, intimidating, and essential tool that maps the relationship between temperature and moisture. How to read it, why it matters, and why it's still relevant in the age of apps and AI.

• Surfaces, Condensation, and Mold: Why moisture risk is one of the few pollutants that can damage the building fabric itself. How dew point, surface temperatures, and adsorptive materials create the conditions for mold growth and structural decay.

• The Case for HVAC-D: Why dehumidification deserves its own prominent place in the HVAC world. How traditional air conditioning treats dehumidification as a byproduct of cooling—and why that doesn't always work.

• Desiccant Dehumidification: How solid and liquid desiccants can achieve moisture removal at levels traditional cold coil systems simply cannot reach—down to negative 100-degree Fahrenheit dew points. The applications in hospitals, pharmaceuticals, semiconductor manufacturing, lithium battery production, and ice rinks.

GUEST:

David Schurk - Owner, HVAC Insight Consultants

https://www.linkedin.com/in/davidschurk/

The Air Quality Matters Podcast in Partnership with

Particles Plus https://particlesplus.com/

Farmwood (https://farmwood.co.uk/) - Eurovent (https://www.eurovent.eu/) - Aico (https://www.aico.co.uk/) - Ultra Protect (https://www.ultra-protect.co.uk/air-quality-matters)

The One Take Podcast in Partnership with

SafeTraces (https://www.safetraces.com/) and Inbiot (https://www.inbiot.es/?utm_campaign=simon&utm_source=airqualitymatters&utm_medium=podcast)

Do check them out in the links and on the Air Quality Matters Website. (https://www.airqualitymatters.net/podcast)

If you haven't checked out the YouTube channel its here (https://www.youtube.com/@airqualitymatters-SimonJones). Do subscribe if you can, lots more content is coming soon.

Chapters

• 00:00:00 Introduction: The Forgotten Child of Indoor Air Quality
• 00:02:27 Is Moisture a Pollutant? Defining the Problem
• 00:04:11 The Human Impact: Perspiration and Core Temperature
• 00:07:57 The Operating Room Problem: When Humidity Becomes Critical
• 00:14:30 Adding the D to HVAC: Why Dehumidification Deserves Recognition
• 00:28:59 Temperature Fundamentals: Dry Bulb, Sensible Heat, and Radiant Energy
• 00:36:05 Relative Humidity Explained: The Fish Tank Analogy
• 00:42:05 The Relative Humidity Trap: Why It Misleads Us
• 00:53:14 Absolute Humidity and Dew Point: The Real Measures That Matter
• 01:06:32 Wet Bulb Temperature: The Sling Psychrometer Explained
• 01:12:13 The Psychrometric Chart: Your Moisture Roadmap
• 01:18:21 Surfaces and Condensation: When Air Meets Materials
• 01:23:58 The Cold Spot Mold Spot Phenomenon
• 01:26:42 Controlling Moisture: The Thermostat Problem
• 01:30:59 The Efficiency Paradox: High SEER and High Humidity
• 01:32:55 Desiccant Dehumidification: Beyond the 32-Degree Limit
• 01:38:44 Real-World Applications: From Lithium Batteries to Pharmaceuticals
• 01:41:16 The Journey of a Dehumidification Jedi

This week, we dive into a question that goes beyond sensors and science: What actually motivates people to invest in clean air for their homes—and does culture change everything?

The paper is titled Indoor Air Quality: Predicting and Comparing Protective Behaviours in Germany and Portugal, published in Indoor Air, and it's based on survey data from 800 participants split evenly between the two nations. This research uses Protection Motivation Theory to unpack the psychological and cultural drivers behind adopting indoor air quality technologies—things like sensors, air purifiers, and ventilation systems.

Key Insights:

• Germany: Autonomy and Family Duty: For German participants, the biggest driver was self-efficacy—the feeling of "I can do this." They need to feel capable, empowered, and in control. There's also a strong link to benevolence caring—particularly protecting close family, especially children. In Germany, you're not buying an air purifier for yourself. You're buying it because you feel a personal responsibility to safeguard your immediate circle.

• Portugal: Prove It Works: For Portuguese participants, self-efficacy didn't move the needle. Instead, it was all about response efficacy—does this thing actually work? They're pragmatic consumers. If you tell them it works, you better be able to prove it. Also, people who already had respiratory conditions were much more likely to adopt the tech—health status mattered in Portugal, but not in Germany.

• Culture Eats Strategy for Breakfast: You can't use the same messaging in Berlin as you do in Lisbon. In Berlin, you say: "Take control of your home and protect your children." In Lisbon, you say: "This device is proven to reduce particulate matter by 99%."

• Fear Doesn't Work: Perceived vulnerability—the feeling that "I am personally at risk of getting sick"—had almost no impact on whether people adopted the technology. None. But perceived severity did. People are motivated when they acknowledge that poor air quality is a serious global or environmental problem—but they aren't motivated by feeling personally weak or susceptible.

• The COVID Hangover: The authors suggest this might be a legacy of the pandemic. We became accustomed to taking protective measures—masks, sanitisers, ventilation—not because we were terrified for our own safety every day, but because we recognised the severity of the threat in a broader, almost civic sense.

This is Part Five of a five-part series exploring the psychology and perception of risk around air quality and ventilation.

Indoor Air Quality: Predicting and Comparing Protective Behaviours in Germany and Portugal

https://doi.org/10.1155/2024/3006342

The One Take Podcast in Partnership with

SafeTraces (https://www.safetraces.com/) and Inbiot (https://www.inbiot.es/?utm_campaign=simon&utm_source=airqualitymatters&utm_medium=podcast)

Do check them out in the links and on the Air Quality Matters Website (https://www.airqualitymatters.net/podcast)

Chapters

• 00:00:00 Introduction: The Psychology of Air Quality Behavior
• 00:00:55 The Missing Episode: Germany and Portugal Study Context
• 00:02:12 The Research Framework: Protection Motivation Theory
• 00:03:07 Threat and Coping: The Two Mental Processes
• 00:03:59 The German Mindset: Self-Efficacy and Family Protection
• 00:04:59 The Portuguese Perspective: Prove It Works
• 00:06:10 One Size Doesn't Fit All: Cultural Messaging Matters
• 00:06:31 The Vulnerability Paradox: Fear Doesn't Drive Action
• 00:07:29 The COVID Legacy: Civic Responsibility Over Personal Fear
• 00:08:15 The Performance Gap Problem: Why Efficacy Matters
• 00:08:53 Demographics and Early Adopters: The Youth Factor
• 00:09:26 Study Limitations and Economic Context
• 00:09:52 The Key Takeaway: From Education to Empowerment
• 00:10:46 The Path Forward: Respect, Severity, and Solutions
• 00:11:17 Closing Thoughts: Understanding the Human Element

This week, we step into one of the most overlooked yet critical areas of air quality and health: the construction site. While we spend so much time talking about indoor air quality during the operational phase of buildings, there's an entire workforce—construction and demolition workers—who spend their careers in environments that are anything but operational. And the risks they face are profound.

We sit down with Angie Brooker, Occupational Health Manager at Multiplex, to explore the layered, dynamic, and often invisible hazards of dust exposure in construction—and what one of the UK's most forward-thinking organisations is doing about it.

Key Topics Discussed:

• The Three Categories of Dust: Wood dust, general construction dust, and silica dust—each with different risks, different sources, and different control measures. Why silica, particularly from artificial stone, has become a focal point of concern.

• The Complexity of Construction Environments: Why construction sites are uniquely challenging—dynamic spaces, changing materials, multiple trades working on top of each other, high turnover, and the constant tension between program deadlines and health protection.

• The Artificial Stone Crisis: How engineered stone (containing up to 90% silica) has caused an epidemic of accelerated silicosis globally—and why Multiplex has banned it on all upcoming projects. The Australia case study, the thousand cases identified, and the proactive public health response.

• Hierarchy of Controls in Practice: From elimination and substitution (banning artificial stone) to engineering controls (on-tool extraction, ventilation) to administrative controls (training, awareness, health intervention tours) to PPE (the right mask, worn correctly, every time).

• The RPE Challenge: Why respiratory protective equipment is the frontline defence—but also why it's so hard to get right. Facial hair, improper fit, leaving masks hanging like "Christmas decorations," the heat and discomfort, and the cultural resistance to wearing them.

• Health Intervention Tours (HITs): How Multiplex walks sites monthly, focusing purely on health hazards, giving positive feedback and room-for-improvement interventions, and using personal dust monitors to make the invisible visible.

• The Silica 25 Programme: Three pillars—prevention (banning artificial stone), protection (appropriate RPE, education, awareness), and detection (health surveillance, lung function testing, baseline chest X-rays).

This is a conversation about risk, responsibility, and the long game. It's about recognising that construction workers deserve to retire healthy—and that every day we delay action, we're storing up a public health crisis for the future.

GUEST:

Angie Brooker - Occupational Health Manager, Multiplex

https://www.linkedin.com/in/angie-brooker-abba85123/

https://www.multiplex.global/

https://www.lungsatwork.org.uk/

The Air Quality Matters Podcast in Partnership with

Farmwood (https://farmwood.co.uk/) - Eurovent (https://www.eurovent.eu/) - Aico (https://www.aico.co.uk/) - Ultra Protect (https://www.ultra-protect.co.uk/air-quality-matters)

The One Take Podcast in Partnership with

SafeTraces (https://www.safetraces.com/) and Inbiot (https://www.inbiot.es/?utm_campaign=simon&utm_source=airqualitymatters&utm_medium=podcast)

Do check them out in the links and on the Air Quality Matters Website. (https://www.airqualitymatters.net/podcast)

If you haven't checked out the YouTube channel its here (https://www.youtube.com/@airqualitymatters-SimonJones). Do subscribe if you can, lots more content is coming soon.

Chapters

• 00:00:00 Introduction: Construction Workers and Air Quality Risk
• 00:01:38 Meet Angela Brooker: Occupational Health in Construction
• 00:03:59 The Dust Challenge: Categories and Construction Hazards
• 00:05:44 The Dynamic Construction Environment: A Complex Risk Landscape
• 00:14:46 The Latent Disease Problem: Why Long-Term Risks Get Ignored
• 00:20:23 The Liability Gap: Accountability for Chronic Occupational Disease
• 00:24:50 The Cultural Challenge: From Bravado to Protection
• 00:36:06 Artificial Stone and Silicosis: The Accelerated Epidemic
• 00:34:42 The Silica 25 Program: Prevention, Protection, and Detection
• 00:09:08 Housekeeping and Hidden Exposures: The Resuspension Risk
• 01:07:57 Respiratory Protection: The Mask Problem
• 00:31:48 Health Intervention Tours: Making Health Visible on Site
• 01:19:47 Monitoring and Measurement: Dust Tracking Technology
• 01:35:14 Health Surveillance: Early Detection and the Medical System
• 01:31:58 The Smoking Factor: Compounding the Risk
• 01:27:12 From Nurse to Construction: Angela's Journey
• 01:39:19 The Path Forward: Getting the Basics Right
• 01:42:12 Closing: Resources and Support for Construction Workers

This week, we dive into a powerful piece of research that moves beyond surveys and snapshots to ask: What actually motivates people in deprived urban communities to change their indoor air quality behaviours—and how long does it take?

The paper is titled Psychological and Contextual Drivers of Indoor Air Quality Behaviours in a Deprived Urban Community: Evidence from Participatory Research, published in Building and Environment, and it's based on the Well Home Project—an 18-month longitudinal study tracking 110 households in West London.

The Central Question

Unlike most studies that rely on a quick one-off survey, this was participatory research. They didn't just treat residents as test subjects—they worked with them, engaged them, installed sensors in their homes, and followed them over time across four waves of surveys. This is crucial because we know that air pollution disproportionately affects deprived communities—people living in substandard housing, closer to busy roads, with higher rates of pre-existing health conditions. So understanding what drives them to act is absolutely vital if we want to address health inequalities.

But here's the fascinating part: self-efficacy grew over time. At the start of the project, confidence didn't make a huge difference. But as the months went on, people with high self-efficacy became increasingly likely to act. Building that muscle of confidence—that feeling of "I can handle this"—is a process, not a switch.

Key Insights:

• The Mold Effect—Visibility is Key: The strongest predictor of behaviour change in the entire study was the presence of visible mold and damp. If people saw mold, they acted. But mold is a late-stage indicator—by the time you see black spots on your wall, you've probably been breathing in damp air for months. We need to make other pollutants visible before the damage is done.

• Engagement is a Marathon, Not a Sprint: The longer people were involved in the Well Home Project, the more likely they were to change their behaviour. Sustained engagement is essential—not just a one-off flyer.

• What Actually Changed: Residents were most likely to report changes in window opening, cooking, and cleaning. But the only behaviours that showed a statistically significant increase over time were cooking and heating. Why? These might require more knowledge or confidence to adopt—things people learned through participation in the project.

• What Didn't Change: Smoking behaviour showed the lowest likelihood of change. Smoking is an addiction—a deeply habitual chemical dependency. Simply telling someone it's bad for indoor air is unlikely to break a nicotine addiction. Some issues require much more specific, targeted health interventions.

• The Education Paradox: Individuals with higher levels of education were actually less likely to adopt behavioural changes. The authors speculate this might be a ceiling effect—people with higher education might already be doing some of the right things before the study even started, so they had less room to improve.

• Participatory Research Works: By working with communities, the researchers didn't just gather data—they helped catalyze change. The residents who stuck with the project became more and more empowered to control their own environment.

This is Part Four of a five-part series exploring the psychology and perception of risk around air quality and ventilation.

Psychological and Contextual Drivers of Indoor Air Quality Behaviours in a Deprived Urban Community: Evidence from Participatory Research

https://doi.org/10.1016/j.buildenv.2025.114089

The One Take Podcast in Partnership with

SafeTraces (https://www.safetraces.com/) and Inbiot (https://www.inbiot.es/?utm_campaign=simon&utm_source=airqualitymatters&utm_medium=podcast)

Do check them out in the links and on the Air Quality Matters Website (https://www.airqualitymatters.net/podcast)

Chapters

• 00:00:00 Introduction: The Psychology of Indoor Air Quality in West London
• 00:01:16 The Well Home Project: Participatory Research in Action
• 00:02:14 The Health Belief Model: Understanding What Drives Action
• 00:03:36 The Key Findings: Severity and Self-Efficacy Win
• 00:04:41 The Mold Effect: When Visibility Drives Action
• 00:05:32 Time and Confidence: The Longitudinal Effect
• 00:06:23 What Changed and What Didn't: Behavior Breakdown
• 00:07:49 The Education Paradox: Challenging Our Assumptions
• 00:08:39 The So What: From Scare Tactics to Empowerment
• 00:10:07 Closing Thoughts: Residents as Active Agents

Welcome back to a solo episode—it's just me this week, fresh off a plane from Las Vegas and the AHR Expo, and honestly, in a bit of a reflective mood. When you spend a week inside the ultimate sealed box that is Vegas—losing track of time, weather, and what the air is actually doing—it puts things in perspective. It's comfort manufactured at massive scale, designed to keep you sedated, happy, and spending money. And stepping back into the real world, looking at the sheer volume of noise landing on my desk—commissions, pledges, papers, announcements—I had to pause.

The Central Question

On one hand, we've never had more attention. We have the Global Commission on Healthy Indoor Air launching at the UN. We have the Global Pledge. We have Ashrae's new Indoor Environmental Quality Centre of Excellence. It feels like the ground is moving. But on the other hand, I look at who's in the room. I look at the jostling for position. And I have to ask: Is this a genuine revolution, or is it a narrative grab? Are we drawing a line in the sand for public health—or building a new VIP section for the haves, while the have-nots are left outside in the smog?

Key Topics Discussed:

• The Narrative Grab: What happens when a grassroots movement gains enough momentum to become valuable—and the big institutions, legacy corporations, and governing bodies realize they need to own a piece of that story. Is the commission a natural reaction of a sector trying to organize itself? Absolutely. But is it also a narrative grab? Potentially, yes.

• Who's in the Room—and Who Isn't: When I scroll through the lists of participants and commissioners, I see a lot of familiar names. Big HVAC. Controls. Sensors. Certification bodies. Real estate. Western academics. But where is the social science? Where are the voices from the Global South—not satellite offices, but grassroots? Where are the housing activists fighting damp and mold in public housing? It feels heavy on corporate real estate, heavy on Western technocracy.

• The Risk of Premium Air: When you turn health into a premium product, you create a two-tier system: platinum-class air for Google headquarters, and the rest of us—schools with windows painted shut, social housing with fans that haven't worked since 2015, industrial units thick with process dust. If the narrative becomes owned by commercial real estate, does clean air become a luxury good you buy, rather than a fundamental human right that is owed?

• The Mandate Debate: A fascinating clash playing out in the academic literature right now. On one side, a paper in Science led by Lidia Morawska and others: Mandating Indoor Air Quality for Public Buildings. Bold, noble, seductive—strict numerical legal mandates for IAQ in public spaces. On the other side, a response from the folks at ISO TC 146 SC 6 and ASTM D22, raising a critical point: is a global mandate actually workable, or even dangerous? What happens when you apply a Western technological fix to a context that simply cannot support it?

• Indoor Environmental Quality—The Big Brother of IAQ: Intellectually, it makes sense. We have eyes, ears, skin, as well as lungs. But I'm terrified that air quality is going to get lost in this mix. We've spent decades trying to get people to care about the invisible. Now compare that to thermal comfort—if the room is two degrees too cold, complaints light up instantly. If we bundle IAQ into IEQ, my fear is the budget goes to the things people complain about. The money goes to new LED lighting, sound dampening panels, heat pumps—and the ventilation? Well, as long as nobody's fainting, we'll value-engineer the filters.

The Air Quality Matters Podcast in Partnership with

Farmwood (https://farmwood.co.uk/) - Eurovent (https://www.eurovent.eu/) - Aico (https://www.aico.co.uk/)

The One Take Podcast in Partnership with

SafeTraces (https://www.safetraces.com/) and Inbiot (https://www.inbiot.es/?utm_campaign=simon&utm_source=airqualitymatters&utm_medium=podcast)

Do check them out in the links and on the Air Quality Matters Website. (https://www.airqualitymatters.net/podcast)

If you haven't checked out the YouTube channel its here (https://www.youtube.com/@airqualitymatters-SimonJones). Do subscribe if you can, lots more content is coming soon.

Chapters

• 00:00:00 Introduction: Reflections from Vegas and the Sealed Box Experiment
• 00:03:24 The Global Commission on Healthy Indoor Air: Progress or Narrative Grab?
• 00:04:47 Who's Missing from the Table? The Representation Problem
• 00:06:02 The Narrative Grab: When Air Quality Goes Mainstream
• 00:08:13 The Premium Product Problem: Clean Air as a Luxury Good
• 00:13:04 The Mandate Debate: Science Paper vs. Practical Reality
• 00:15:51 The Parachute Solution: Why One-Size-Fits-All Standards May Fail
• 00:19:00 Indoor Environmental Quality: The Marvel Movie Problem
• 00:24:38 The Broken Delivery System: When Platinum Buildings Fail
• 00:28:12 The Path Forward: From Talking Shops to Ground Truth

This week, we tackle a question that goes beyond sensors, standards, and science: Do you trust the people telling you the air is bad? And more importantly—does that trust, or lack of it, actually change what you do about it?

The paper is titled Communicating Particulate Matter Risk: The Effects of Empoweredness and Trust in Government Information and Protective Behaviour, published in the International Journal of Urban Sciences, and based on research conducted in Seoul, South Korea.

The Central Question

We know air pollution is a killer—7 million premature deaths a year globally. Governments know this too. They push out information: air quality indexes, apps, text alerts, and behaviour recommendations. Wear a mask. Don't exercise outdoors. But here's the problem: not everyone listens. Even when the information is right there in front of them, people don't always take protective action. Why is that?

This paper argues that the traditional models of risk communication—focusing on threat perception and efficacy—are missing something crucial: trust in the messenger.

The Big Takeaway

The study found that trust in government information acts as a moderator—a boundary condition. For people with low trust in the government's information, it didn't matter how much hope they had or how much they believed their mask could work. If they didn't trust the source, those feelings didn't translate into action.

Trust unlocks the potential of the other motivations. It allows an individual's sense of empowerment to actually extend into behavioural change.

Key Insights:

• Empoweredness Goes Beyond Individual Efficacy: The paper introduces an expanded concept of empoweredness that includes hope (visualizing a future with clean air), values (believing it's meaningful to reduce pollution), and collective response efficacy (believing we can fix this together as a society).

• Values Matter: People were more likely to take action if they felt that reducing PM was a worthwhile or meaningful thing to do—not just about self-preservation, but about environmental stewardship and intrinsic value.

• Hope Only Works With Trust: For people with low trust, hope might just be wishful thinking or even a form of denial. But with trust, hope becomes a driver for action.

• Collective Efficacy Needs a Trusted Conductor: Believing society can handle the risk only led to personal action if the person trusted the government information. People need to feel that the conductor of the orchestra is competent and honest before they're willing to play their part.

• Citizen Science as a Trust-Building Tool: By involving the public in data collection—giving them sensors, letting them see the data for themselves—you increase transparency. When people participate in the science, they trust the data. And when they trust the data, they're more likely to listen when you tell them how to protect themselves.

Communicating Particulate Matter Risk: The Effects of Empoweredness and Trust in Government Information and Protective Behaviour

https://doi.org/10.1080/12265934.2024.2344456

The One Take Podcast in Partnership with

SafeTraces (https://www.safetraces.com/) and Inbiot (https://www.inbiot.es/?utm_campaign=simon&utm_source=airqualitymatters&utm_medium=podcast)

Do check them out in the links and on the Air Quality Matters Website (https://www.airqualitymatters.net/podcast)

Chapters

• 00:00:00 Introduction: The Psychology of Trust in Air Quality
• 00:01:10 The Seoul Laboratory: Why This Study Matters Globally
• 00:01:39 The Information Paradox: Why Data Doesn't Equal Action
• 00:02:18 Beyond Fear: The Extended Parallel Process Model
• 00:03:10 Empoweredness: The Missing Piece of the Puzzle
• 00:03:40 The Secret Sauce: Trust in Government Information
• 00:04:00 The Research Results: What 513 Citizens Revealed
• 00:04:50 Values and Meaning: The Power of Intrinsic Motivation
• 00:05:52 The Trust Boundary: When Hope and Efficacy Turn On or Off
• 00:06:46 The Implications: Why Technical Proof Isn't Enough
• 00:07:53 Collective Efficacy and the Orchestra Conductor
• 00:08:25 Building Trust: Citizen Science as a Solution
• 00:09:43 The Big Takeaway: Engineers Must Become Trust Builders

We sit down with Dr. José Luis Castro, Director General Special Envoy for Chronic Respiratory Diseases at the WHO, to confront one of the most overlooked yet devastating health crises of our time: chronic respiratory diseases—specifically asthma and COPD.

With over three decades of experience in global health leadership, he has dedicated his career to advancing sustainable health initiatives across developing countries and urban centres worldwide.

The Central Question

When a child can't breathe, everything else stops. But when an adult has COPD, the world kind of crosses the street. Why? COPD is the hidden respiratory crisis—often met with a shrug, silent judgement, or post-pandemic fear. We assume it's a consequence of lifestyle choices. We tell ourselves they brought it on themselves somehow, and in doing so, we give ourselves permission to look away. This judgement is a failure of empathy and a failure of society.

Key Topics Discussed:

• The Scale of the Crisis: Over half a billion people affected. 3.5 million deaths every year. Yet only one article in the New York Times in 2024—an obituary. Why chronic respiratory diseases are the Cinderella of public health.

• The Stigma Problem: How COPD has been framed as a "smoker's disease"—and why that narrative is both scientifically wrong and morally dangerous. The role of air pollution, occupational exposure, and early-life lung injury in creating this invisible epidemic.

• What COPD Actually Looks Like: A visceral, unflinching picture of life with COPD—from three oxygen cylinders (one by the bed, one in the toilet, one in the living room) to the slow suffocation of social isolation, breathlessness, and the erosion of dignity. Why breathlessness is invisible—and why that invisibility is deadly.

• The Indoor Air Connection: Why the majority of our exposure to outdoor air pollution occurs indoors. How the built environment—our homes, schools, and workplaces—is either protecting us or slowly poisoning us. The fundamental contract we have with buildings is broken.

• Environmental Justice: Why this is not just a problem for "the poor" or "smokers"—it's a problem for all of us. Anyone who breathes is at risk. And we are only one diagnosis away from being vulnerable ourselves.

GUEST:

Dr. José Luis Castro - Director General Special Envoy for Chronic Respiratory Diseases, WHO

https://www.linkedin.com/in/jose-luis-castro/

https://www.emro.who.int/health-topics/chronic-obstructive-pulmonary-disease-copd/

https://www.who.int/

The Air Quality Matters Podcast in Partnership with

Farmwood (\"https://farmwood.co.uk/\") - Eurovent (\"https://www.eurovent.eu/\") - Aico (\"https://www.aico.co.uk/\")

The One Take Podcast in Partnership with

SafeTraces (\"https://www.safetraces.com/\") and Inbiot (\"https://www.inbiot.es/?utm_campaign=simon&utm_source=airqualitymatters&utm_medium=podcast\")

Do check them out in the links and on the Air Quality Matters Website. (\"https://www.airqualitymatters.net/podcast\")

If you haven't checked out the YouTube channel its here (\"https://www.youtube.com/@airqualitymatters-SimonJones\"). Do subscribe if you can, lots more content is coming soon.

Chapters

• 00:00:00 Introduction: The Silent Crisis of Chronic Respiratory Disease
• 00:02:31 Meet Jose Luis Castro: The WHO's Mission on Respiratory Health
• 00:04:44 The Staggering Numbers: Half a Billion People Affected
• 00:08:01 The Stigma Problem: Why COPD Gets Ignored
• 00:11:20 Clean Air as a Human Right: The UN General Assembly Pledge
• 00:13:46 From Numbers to Action: Making Air Quality Personal
• 00:17:30 The Inequality of Exposure: Environmental Justice and Air Quality
• 00:26:41 The Tobacco Parallel: Lessons from Successful Policy Change
• 00:29:28 Agency and Action: Why Individual Power Matters
• 00:36:43 The Invisible Organ: Why We Don't Talk About Lungs
• 00:39:17 Childhood Exposure: Creating Glass Ceilings for Young Lungs
• 00:43:38 What COPD Really Looks Like: A Paramedic's Perspective
• 00:47:33 Living with COPD: The Oxygen Tank Reality
• 00:52:58 The Coughing Boy: Social Isolation and Respiratory Disease
• 00:58:41 Beyond Smoking: The Real Causes of COPD
• 01:03:22 Early Detection and Spirometry: The Diagnostic Challenge
• 01:07:00 The Economic Case: Healthcare Costs and Productivity Loss
• 01:07:59 Occupational Health: Construction, Welding, and Workplace Exposure
• 01:14:25 The 2025 Breakthrough: Political Recognition at Last
• 01:17:01 Breaking Down Silos: Why Doctors Must Ask About Buildings
• 01:19:27 The Built Environment is in Us: Rethinking Our Relationship with Buildings
• 01:24:42 Jose's Journey: From TB to COPD
• 01:27:41 The Universal Threat: Why This Affects Everyone
• 01:33:15 Closing Thoughts: Breathing as the Starting Point