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This system presents annual summaries of air pollution data from two EPA databases:

  • AQS (Air Quality System) database provides air monitoring data - ambient concentrations of criteria and hazardous air pollutants at monitoring sites, primarily in cities and towns.
  • NEI (National Emission Inventory) database provides estimates of annual emissions of criteria and hazardous air pollutants from all types of sources.


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Last Updated: July 31, 2017