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Note: The Beltsville and Blackwater NWR monitors are operated by EPA CASTNET. Prior to 2011, the monitors did not follow EPA required quality checks for regulatory use.

Data are preliminary and subject to validation
AQI Conversion Charts: Ozone  Particulate Matter (PM)

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Air Quality Forecast Hotlines
Metro Washington: 202-589-1212
Metro Baltimore: 410-537-3247

  • Clean Air Partners
  • •
  • 777 North Capitol St, Suite 300
  • •
  • Washington DC 20002
  • •
  • Tel: (877) 515-4593
  • •
  • Fax: (202) 962-3202