4 Most Common Themes
1. ULEZ cuts traffic‑related pollution and eases breathing
"I've needed my inhaler way less since the ULEZ came in." – stuaxo
"ULEZ massively reduced the amount of NO2, which is a trigger for asthma." – tarkasteve
2. London’s Underground has notoriously dirty air
"I've lived on Upper Street ... there was always a layer of black dust inside." – lazide
"I only get black bogeys on days that I've been on the tube." – walthamstow
3. Housing is often built next to highways, harming health
"A friend ... you should not live within a third of a mile of a highway." – roughly
"Notably, most major cities have been building tons of housing ... right next to highways." – lazide
4. Mitigation and policy debate (air purifiers, research controversy)
"More anecdata: I've been using my inhaler more since moving to a city with worse air quality." – energy123
"The point is that if you want to be the chivalrous man … you still should choose the roadside side of the pavement." – TheOtherHobbes