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      Local Data Search


      District of Columbia Air Quality

      Topics:Air Quality Index (AQI)Suspended Particulate (TSP)Lead (TSP) STPCarbon Monoxide (CO)Sulfur Dioxide (SO2)Nitrogen Dioxide (NO2)OzoneParticulate Matter (PM)10Particulate Matter (PM)2.5

      Air Quality Index (AQI), #43

      Air quality indices (AQI) are numbers used by government agencies to characterize the quality of the air at a given location. As the AQI increases, an increasingly large percentage of the population is likely to experience increasingly severe adverse health effects. Air quality index values are divided into ranges, and each range is assigned a descriptor and a color code. Standardized public health advisories are associated with each AQI range. The United States Environmental Protection Agency (EPA) uses the following AQI:

      Air Quality Index (AQI) ValuesLevels of Health ConcernColors
      0 to 50GoodGreen
      51 to 100ModerateYellow
      101 to 150Unhealthy for Sensitive GroupsOrange
      151 to 200UnhealthyRed
      201 to 300Very UnhealthyPurple
      301 to 500HazardousMaroon

      Total Suspended Particulate (TSP)

      Tiny airborne particles or aerosols that are less than 100 micrometers are collectively referred to as total suspended particulate matter (TSP).

      Lead (TSP)

      Pb (TSP) is a measurement of the amount of elemental lead in total suspended particulate (TSP).

      Carbon Monoxide (CO)

      Sulfur Dioxide (SO2)

      Nitrogen Dioxide (NO2)


      Particulate Matter (PM)10

      Particulate Matter (PM)10 is used to describe particles of 10 micrometers or less.

      Particulate Matter (PM)2.5

      Particulate Matter (PM)2.5 is used to describe particles of 2.5 micrometers or less.

      The information on this page is based on the air quality database from the U.S. Environmental Protection Agency (EPA). District of Columbia has a total of 31 monitoring sites.

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