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When we talk about air pollution, we often think of it as an environmental issue – something that affects our skies and lungs. But the reality is far more complex and concerning. What if I told you that the particles you breathe in right now could be traveling through your bloodstream to every organ in your body?

Sir Stephen Holgate, a distinguished physician and leading expert in respiratory medicine, joins us to unpack the multisystemic nature of air pollution. With over 50 years of research experience and a knighthood for his contributions to medical research, he explains how particulate matter doesn't just irritate our lungs – it passes through them into our circulation, delivering harmful chemicals to our brain, heart, liver, and beyond.

"These very small particles get into the bloodstream and they circulate to every organ of the body," he explains. "It accelerates the aging process of those tissues or organs." This understanding has led researchers to now associate approximately 700 different diseases with air pollution exposure.

The conversation takes us from the scientific mechanisms of how pollution damages our bodies to the broader societal implications. We explore the inequalities in exposure, with disadvantaged communities bearing the greatest burden while having the least say in regulations. He makes a compelling case that breathing clean air should be considered a human right, much like access to clean water.

Perhaps most fascinating is the discussion of our body's barrier functions and how modern environments have overwhelmed these natural defenses. Sir Stephen Holgate shares remarkable research comparing traditional farming communities like the Amish, who have virtually no allergies or asthma, with genetically similar populations who adopted modern Western lifestyles. The difference? Their relationship with the natural world and the microorganisms that shape our immune systems.

Whether you're concerned about your health, interested in environmental justice, or simply curious about why asthma rates have skyrocketed in the UK, this conversation offers invaluable insights into how we might create healthier communities by cleaning up the air we all share. 

Sir Stephen Holgate

Sir Stephen Holgate - Imperial Alumni Awards

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