Hong Kong average life expectancy is 85. Iceland is 83. Hong Kong has poor air quality and Iceland has some of the best.
I'm for better air quality but it's just part of the puzzle.
https://pubmed.ncbi.nlm.nih.gov/29682692/
"Exposure to fine particulate matter (PM2.5) has been associated with increased risk of heart disease,1 insulin resistance (IR),2 and diabetes,3 all conditions that are characterized by inflammation"
https://ehp.niehs.nih.gov/doi/full/10.1289/ehp.122-a29
Basically, if it causes an immune/inflamatorry response, it leads to chronic disease
https://www.health.harvard.edu/staying-healthy/inflammation-...