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This U.S. EPA Office of Air and Radiation (OAR) - Office of Air Quality
Planning and Standards (OAQPS) web service contains the following air
quality monitoring network point location layers: CO (carbon monoxide),
Lead, Lead-TSP(LC) (lead, total suspended particulates, local
conditions), Lead-PM10(LC) (lead, particluate matter up to 10um in size,
local conditions), NO2 (nitrogen dioxide), Ozone, PM10 (particulate
matter up to 10um in size), PM2.5 (particulate matter up to 2.5um in
size), SO2 (sulfur dioxide), PM2.5 Chemical Speciation Network, IMPROVE
(Interagency Monitoring of Protected Visual Environments), NATTS
(National Air Toxics Trends Stations), NCORE (Multipollutant Monitoring
Network). Layers are drawn at all scales.For more info: https://www.epa.gov/outdoor-air-quality-data