Air Pollution Data Sources is a website with an overview of (and links to) all EPA sites where someone can get air quality and emissions data.
AIRData access to annual summaries of air pollution data.
AIRNOW is the EPA site with current Air Quality Index (AQI) levels indicating how clean the air is and whether it will affect your health.
AQS (Air Quality System) is EPA's repository of ambient air quality data. AQS stores data from over 10,000 monitors; 5000 of which are currently active.
AMTIC (Ambient Monitoring Technology Information Center) contains information and files on ambient air quality monitoring programs, details on monitoring methods, relevant documents and articles, information on air quality trends and nonattainment areas, and federal regulations related to ambient air quality monitoring.
CDX (Central Data Exchange) is the EPA's electronic reporting site.
State and Local Air/Environmental Agencies links to regional, state and local agency pages.
CHIEF (Clearinghouse for Inventories and Emissions Factors) is the EPA site that includes the NEI (National Emissions Inventory) database. The NEI replaces AFS as the EPA's repository of air emissions information for facilities, area, and mobile sources.
AFS (AIRS Facility Subsystem) formerly a subsystem of the Aerometric Information Retrieval System (AIRS) now operated and maintained by the EPA's Office of Enforcement and Compliance Assurance (OECA).
DISCLAIMER: The following links are pointers to other hosts and locations on the Internet. This information is provided as a service. However, the U.S. Environmental Protection Agency does not endorse, approve or otherwise support the non-EPA sites.
Exchange Network for AQS data exchange (Node to node)
ECOS (Environmental Council of the States)
IMPROVE (National Park Service visibility data, operated by Colorado State University)