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Air Quality Data provided by the South Coast Air Quality Management District (AQMD) (aqmd.gov) and CARB - California Air Resources Board (arb.ca.gov)
Note that the measurements for PM2.5 (fine particulate matter), PM10 (respirable particulate matter), O3 (ozone), CO (carbon monoxide) and NO2 (nitrogen dioxide) are taken from the station Rubidoux - Mission Blvd, Riverside