https://aqi.zfe.space/
全国主要城市空气质量 data from pm25.com
data
https://portal.ct.gov/deep/air/planning/particulate-matter/pm25-planning-efforts-attainment-designations
PM25 Planning Efforts Attainment Designations
planning effortsattainmentdesignations
https://docs.google.com/viewer?url=https%3A%2F%2Fprivate.eprw2020.com%2Fdownload%2Fpm25%2F%3Find%3D0%26filename%3Dpdfs%2Forals%2FEPRW+2020++-++PM25.pdf%26wpdmdl%3D12840%26refresh%3D69e7cc932a10a1776798867%26open%3D1&embedded=true
/download/pm25/
download