Full Metadata This U.S. EPA Office of Air and Radiation (OAR) - Office of State Air Partnerships (OSAP) 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