Partly inspired by @albrgr's tweets, I dug a little more into recent findings on the relationship between air pollution and cognition. The effects seem rather amazingly large: https://patrickcollison.com/pollution .
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Traffic-generated NO2 and VOCs are even worse in congested urban centers (hence the backlash on diesel ICE cars in Europe). Living less than 150m from a high-traffic road can increase childhood leukemia rates by 30% due to benzene concentrations:https://academic.oup.com/aje/article/182/8/685/207208 …
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Also worth noting emerging consensus on harmful consequences of exposure to nano-particulates (“PM1” where optical diameter is < 1μm). Δ between quiet and busy street increases brain cancer odds by 10%: https://pdfs.journals.lww.com/epidem/9000/00000/Within_City_Spatial_Variations_in_Ambient.98468.pdf …
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The main driver is actually NO2. I can't find the paper but there a study which found IQ reduction in London due to NO2 exposure. e.g. Italian paper with similar finndings https://www.researchgate.net/publication/282362222_Air_pollution_and_cognitive_development_at_age_seven_in_a_prospective_Italian_birth_cohort … NO2 = Nitrogen dioxide Heavy diesel vehicles are main creators.
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By what mechanism?
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Particulate matter is what is measured, but most air quality sensors can't measure many other substances. eg. when there is a lot of wood smoke, that will show up as particulate matter on the sensors, but smoke has other components such as acetaldehyde that affect human health.
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