Record Setting PM2.5 Air Quality in 2016

  • Zero exceedances of the 1997 24-hour PM2.5 standard of 65 µg/m3 during an entire calendar year for the first time in Valley history
  • Fewest exceedances of the 2006 24-hour PM2.5 standard of 35 µg/m3
  • Highest number of “Good” Air Quality Index (AQI) days across all of the District’s counties
  • Fewest number of “Unhealthy” AQI days across all counties

24 Hour Pm 2.5 Standard