Air Quality Matters

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)

• 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.

• 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)

• 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.

• 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)

• 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.

• 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

Welcome back to Air Quality Matters and One Take, where we unpack the latest research shaping our understanding of indoor air and the built environment.

This week, we're diving into a paper that asks a deceptively simple question: If people could actually see the air they breathe, would they change their behavior? And perhaps more importantly for policymakers—is it worth the money to help them do it?

The paper is titled Making the Invisible Visible: The Impact of Revealing Indoor Air Pollution on Behavior and Welfare, a working paper from the National Bureau of Economic Research by Robert Metcalf and Seffy Roth. And the results are, quite frankly, staggering.

The Central Question

We spend about 90% of our time indoors, and we know that indoor air can be significantly worse than outdoor air. But for most people, it's completely invisible—an unobserved good. You don't know if the air is toxic or pristine unless you have a monitor. And because you don't know, you can't manage it.

So what happens when you make the invisible visible?

The Big Takeaway

This paper moves the conversation from health to economics—and it's sadly the language that often gets policy moving. It suggests that in this specific case, the deficit model—the idea that people just lack information—is actually true. When you give people the information, they do act. They do change their behavior. And that change is big.

This paper tells us we need to stop treating indoor air quality as a private luxury and start treating it as a public health imperative with a massive economic upside. Whether it's monitors or air purifiers (which they also found had an infinite return on investment, by the way), the technology exists. We just need to make the invisible visible.

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

Making the Invisible Visible: The Impact of Revealing Indoor Air Pollution on Behavior and Welfare

https://www.nber.org/papers/w33510

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)

• 00:00:00 Introduction: Making the Invisible Visible
• 00:01:14 The Invisible Problem: Why Indoor Air Quality Matters
• 00:01:44 The Study Design: A Clever Field Experiment in Camden
• 00:02:47 The Baseline Reality: What the Data Revealed Before Intervention
• 00:04:15 The Dramatic Results: 34% Reduction in Pollution Exposure
• 00:05:09 How They Did It: Ventilation Without Lifestyle Sacrifice
• 00:06:15 The Economic Case: Infinite Return on Investment
• 00:08:31 The Energy Efficiency Tension: A Critical Warning
• 00:09:28 Study Limitations: What to Keep in Mind
• 00:10:32 The Big Takeaway: Information Drives Action and Economic Value

In this essential episode, we sit down with Parag Cameron Rastogi, Director of Real Asset Analytics at GRESB, to explore one of the most powerful yet often misunderstood forces shaping the future of indoor air quality: how we measure, benchmark, and value the performance of buildings at scale.

GRESB—the Global Real Estate Sustainability Benchmark—has trillions of dollars of assets in its system. It is the machinery behind how pension funds, investors, and asset managers assess risk, performance, and long-term value across portfolios spanning every continent, building type, and climate zone. And it is evolving—fast—from a disclosure-based model to a performance-based one.

The Central Question

We already have the tools and knowledge to deliver clean, healthy indoor air. So why is there still such a persistent gap between what we know works in theory and what actually happens in buildings? And how can we operationalize air quality data in a way that makes it financially material, benchmarkable, and valuable—not just for compliance, but for real-world decision-making?

Key Topics Discussed:

• What GRESB Is and Why It Matters: How a standardized survey sent to building owners and managers became the global standard for assessing sustainability risk in real estate—and why pension funds with 50-year time horizons care deeply about the long-term performance of the assets they invest in.
• From Disclosure to Performance: The seismic shift happening in 2028, when GRESB moves from rewarding having data to rewarding what that data shows. Why this is a big deal for the industry—and what it means for air quality.
• The Binary Nature of Data: Why building portfolios either have full data coverage or almost none—and nothing in between. The fascinating bimodal distribution of data availability, and what it tells us about control, building type, and lease structures.
• Relative Benchmarking vs. Absolute Thresholds: Why finance speaks the language of risk, not absolutes. How GRESB uses relative benchmarking to compare buildings in context—and why this approach might be the missing piece in how we communicate air quality risk.

This is a conversation about risk, value, and the machinery of change. It's about recognizing that if we want air quality to matter in the real world, we need to speak the language of the people who control the capital. We need to make it benchmarkable, measurable, and material. And we need to move from fluffy aspirations to hard performance.

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

https://www.gresb.com/

HOST:

Simon Jones: https://www.linkedin.com/in/simon-air-quality-matters/

GUEST:

Parag Cameron Rastogi - Director of Real Asset Analytics, GRESB

The Air Quality Matters Podcast in Partnership with

Farmwood - Eurovent - Aico

The One Take Podcast in Partnership with

SafeTraces and Inbiot

Do check them out in the links and on the Air Quality Matters Website.

If you haven't checked out the YouTube channel its here. Do subscribe if you can, lots more content is coming soon.

• 00:00:00 Introduction: GRESB and the Global Real Estate Sustainability Benchmark
• 00:02:00 What is GRESB? Origins and the Investor's Need for Risk Transparency
• 00:05:30 From Portfolio to Asset Level: The Evolution of GRESB Assessment
• 00:10:50 The Foundation and the Industry: How GRESB Standards are Governed
• 00:15:45 Data Coverage: The Binary Reality of Building Performance Data
• 00:24:00 The Disclosure to Performance Paradigm Shift
• 00:34:00 Control Structures and the Triple Net Problem
• 00:44:00 Relative Benchmarking: Why Context Matters in Risk Assessment
• 00:54:00 The Long Tail of Real Estate: Addressing the Forgotten Buildings
• 01:03:45 Operationalizing Data: From Collection to Business Value
• 01:12:00 The Automotive Analogy: Building Feedback Loops for Improvement
• 01:22:00 Stars, Quintiles, and Narrative-Based Rankings
• 01:32:00 Sustainability-Linked Loans and the Financial Incentive
• 01:42:00 Indoor Air Quality's Journey: From Disclosure to Performance Pillar
• 01:52:00 Beyond Productivity: Health, Harm, and the DALY Framework
• 01:58:00 The Predictive Future: From Rearview Mirror to Digital Twin
• 02:03:00 Parag's Journey: From Building Physics to Real Estate Finance
• 02:07:00 Closing Thoughts: The Power of Scale and Systemic Change

Welcome back to Air Quality Matters and One Take, where we unpack the latest research shaping our understanding of indoor air and the built environment.

This week, we step away from the physics and chemistry of air quality and dive firmly into the psychology of how we perceive—and crucially, misperceive—the air around us.

The paper is titled Why Do We Misperceive Air Pollution? A Scoping Review of Key Judgmental Biases, published in Air Quality, Atmosphere & Health, and it systematically dismantles a dangerous assumption many of us hold: that if we just give people the data—the graph, the PM2.5 reading, the red light on a sensor—they'll change their behaviour.

The Central Question

Why do we struggle so much to communicate the risk of poor air quality, particularly in our homes? And why do technical solutions—ventilation systems, sensors, standards—so often fail to deliver the health outcomes we expect?

The answer, this paper argues, is that our brains are essentially wired to misinterpret or even ignore the quality of the air we breathe, regardless of the facts. Information does not equal action. Perception is not reality—but for the person living in that home, perception is their reality.

The Six Psychological Biases That Blind Us to Air Pollution

The Big Takeaway:

Our current approach to communication—largely based on "deficit models" (the idea that people just lack information)—is fundamentally flawed. We can't just put a sensor in a room, point to the red light, and expect people to behave differently. These biases are working in the background to minimize that signal.

If someone has a home halo effect, they'll look at the red light and think the sensor is broken, rather than their air is toxic.

To be effective—whether as engineers, consultants, housing officers, or policymakers—we need to stop treating occupants like passive recipients of data. We need to understand the social and psychological context they live in. We need to acknowledge emotional connections, offer alternatives that provide the same sense of comfort without the emissions, and recognize that unless we bridge the gap between technical reality and lived perception, all the ventilation systems in the world won't deliver the health outcomes we want.

The technical solution is only half the battle. The messy, biased, emotional human element is where the real challenge lies.

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

Why do we misperceive air pollution? A scoping review of key judgmental biases

https://doi.org/10.1007/s11869-024-01650-y

The One Take Podcast in Partnership with

SafeTraces and Inbiot

Do check them out in the links and on the Air Quality Matters Website

• 00:00:00 Introduction: The Psychology of Air Perception
• 00:01:19 The Assumption We All Make: Data Equals Action
• 00:02:33 Sensory Capacity: When Our Senses Fail Us
• 00:03:10 Habituation: The Nose Blindness Phenomenon
• 00:03:54 The Home Halo Effect: My Sanctuary Can't Be Toxic
• 00:05:07 Confirmation Bias: Pollution Happens to Someone Else
• 00:05:44 The Exclusion Effect: Bigger Problems Crowd Out Air Quality
• 00:06:29 The Affect Heuristic: Emotion Over Evidence
• 00:07:33 The So What: Rethinking Communication and Engagement
• 00:09:29 The Big Takeaway: Perception is Their Reality
• 00:10:15 Closing: Part One of Five on Psychology and Risk Perception

We sit down with John O'Connor, former chair of Ireland's Housing Commission, and Neil Freshwater, Public Affairs Manager for GB and Ireland at Velux, to explore one of the most complex challenges facing Ireland and Europe today: how do we deliver affordable housing at pace while ensuring homes are healthy, sustainable, and fit for purpose?

Recorded at a Healthy Homes Ireland event in Dublin just before Christmas, this conversation tackles the fundamental tensions in housing policy—between volume and quality, affordability and performance, political cycles and long-term planning. With Ireland's new housing plan published, the European Commission preparing its first-ever affordable housing plan, and the revised Energy Performance of Buildings Directive due to be transposed into Irish law by May 2026, the stakes have never been higher.

The Central Question

We've understood for over a century that housing and health are inseparable. Yet somehow, in our rush to solve the housing crisis, we've fragmented that relationship. How do we get back to first principles? How do we ensure that every home—not just the expensive ones—delivers good air quality, daylight, thermal comfort, and the conditions for families to thrive?

Key Topics Discussed:

• The Housing Commission's Vision: Why Ireland's housing crisis isn't just about numbers—it's about creating a cohesive society where having a home is a fundamental right, not a luxury. The Commission's recommendations as a long-term, interconnected menu—not a pick-and-mix.
• The Forgotten Link Between Health and Housing: How ventilation and daylighting were central to 19th and early 20th-century housing standards—and why we've lost that focus in modern construction. The sobering reality that people John knows are now suffering terminal illnesses due to poor indoor air quality.
• Fast, Cheap, and Good—Pick Any Two: The political and economic pressures driving volume over quality. Why "any shelter is better than no shelter" is a dangerous narrative—and how 5,000 children experiencing homelessness in Ireland today (compared to fewer than 100 a decade ago) lays bare the human cost of failure.
• The One-Dimensional Trap: How the Energy Performance of Buildings Directive initially focused only on energy efficiency—and why the inclusion of Indoor Environmental Quality (IEQ) in the revised directive is a game-changer, if we can translate it into policy and practice.

Because at the end of the day, it's not about units. It's about homes. And homes are for people.

HOST:

Simon Jones: https://www.linkedin.com/in/simon-air-quality-matters/

GUESTS:

John O'Connor - Former Chair, Housing Commission, Ireland

Neil Freshwater - Public Affairs Manager, Velux GB & Ireland

The Air Quality Matters Podcast in Partnership with

Farmwood - Eurovent - Aico

The One Take Podcast in Partnership with

SafeTraces and Inbiot

Do check them out in the links and on the Air Quality Matters Website.

If you haven't checked out the YouTube channel its here. Do subscribe if you can, lots more content is coming soon.

• 00:00:00 Introduction: Housing, Health, and the Irish Context
• 00:02:56 Meet the Guests: John O'Connor and the Housing Commission
• 00:04:39 The Housing Crisis: Numbers, Demographics, and the Meaning of Home
• 00:09:25 Neil Freshwater: Velux's Origins in Healthy Buildings
• 00:16:25 The Trifecta Challenge: Fast, Cheap, and Good
• 00:17:52 The Forgotten Science: Air Quality and Ventilation in Housing
• 00:21:04 Daylight Inequality and the Quality Divide
• 00:45:56 The Monitoring Revolution: From Code Compliance to Performance
• 00:53:03 The Skills and Labour Crisis: Building at Lightning Pace
• 01:02:41 Modern Methods of Construction: Promise and Reality
• 01:05:01 Looking Forward: Ireland's EU Presidency and the Path Ahead
• 01:11:14 Closing: The Charter for Healthy Homes