@luckytran Air quality should be a much bigger concern for everyone. No other intervention / improvement so positively affects disease spread, intellectual performance, incidence of cardiovascular & metabolic diseases, and on and on.
As far as return on investment in public health goes, improving air quality is probably only rivaled by indoor plumbing and obstetrics/pediatrics.
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Pittsburgh: a polluting coke plant is suddenly closed. Emergency visits for cardiovascular disease decreased 42% immediately, continued over 3 yrs
At 1000ppm CO2, decision making is measurably impaired. At 2500ppm that impairment becomes substantial. Those are numbers I wouldn't be surprised to see in a home even with a modern HVAC system or in a meeting room after half an hour of people sharing the same space.
Road proximity (< 50 m from a major road or < 150 m from a highway) was associated with non-Alzheimer's dementia, Parkinson's disease, Alzheimer's disease, and multiple sclerosis.
PM2.5 now also has a well-researched link to Type 2 diabetes. Both in multiple studies with "WEIRD" subjects as well as south-east Asian populations exposed to higher levels of PM2.5.