Air Quality Index (AQI) Calculation The Air Quality Index is based on measurement of particulate matter (PM 2.5 and PM 10), Ozone (O 3), Nitrogen Dioxide (NO 2), Sulfur Dioxide (SO 2) and Carbon Monoxide (CO) emissions.Most of the stations on the map are monitoring both PM 2.5 and PM 10 data
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https://map.purpleair.com
Компания выпускает датчики загрязнения, у них местами сеть гораздо плотнее, чем у государственных структур.