We extract data periodically from these databases for use in AIR Data . Air pollutant monitoring information is refreshed monthly, usually on the first Tuesday. EPA revises the air pollutant emissions databases, NET and NTI, every three years, with minor updates at least annually. We extract emissions data from these databases each time they are updated. Features Here are the main types of information in AIR Data .
Sources are where air pollution comes from.
Monitors measure how much pollution is in the air. Monitor Reports provide annual summaries of air pollution measurements at individual monitoring stations, and tell where monitoring stations are located. Monitor Queries provide access to an interim AIRS database which has more detailed information about monitor descriptions and annual summary data for more pollutants. Maps show the locations of monitoring sites and areas of the country where air pollution levels exceed health-based EPA standards. Contacts gives the names, addresses, and phone numbers of people in EPA and state environmental agencies to contact about air pollution data.