Air Quality in Maryland
10-year air quality trends for 16 monitored areas in Maryland.
See full Maryland air quality rankings →All Monitored Areas in Maryland
Howard, Maryland
Howard County · AQI 37 (5yr avg) · Improving · PM2.5
Prince George's, Maryland
Prince George's County · AQI 42 (5yr avg) · Improving · Ozone
Kent, Maryland
Kent County · AQI 40 (5yr avg) · Improving · Ozone
Baltimore (City), Maryland
Baltimore (City) County · AQI 43 (5yr avg) · Improving · PM2.5
Calvert, Maryland
Calvert County · AQI 39 (5yr avg) · Improving · Ozone
Garrett, Maryland
Garrett County · AQI 39 (5yr avg) · Improving · Ozone
Anne Arundel, Maryland
Anne Arundel County · AQI 40 (5yr avg) · Improving · Ozone
Charles, Maryland
Charles County · AQI 39 (5yr avg) · Improving · Ozone
Montgomery, Maryland
Montgomery County · AQI 41 (5yr avg) · Improving · PM2.5
Washington, Maryland
Washington County · AQI 42 (5yr avg) · Improving · PM2.5
Cecil, Maryland
Cecil County · AQI 42 (5yr avg) · Improving · PM2.5
Dorchester, Maryland
Dorchester County · AQI 41 (5yr avg) · Improving · Ozone
Harford, Maryland
Harford County · AQI 44 (5yr avg) · Improving · PM2.5
Carroll, Maryland
Carroll County · AQI 42 (5yr avg) · Stable · Ozone
Frederick, Maryland
Frederick County · AQI 42 (5yr avg) · Stable · Ozone
Baltimore, Maryland
Baltimore County · AQI 45 (5yr avg) · Stable · Ozone
Frequently Asked Questions
Maryland has 16 monitored areas with an average 5-year AQI of 41 and an average Air Quality Grade of B. 13 cities are improving, 1 are worsening, and 2 are stable.
Howard, Maryland has the best Air Quality Grade (B) in Maryland with a 5-year average AQI of 37.
Of 16 monitored areas in Maryland, 13 are showing improving trends, 1 are worsening, and 2 remain stable over the past decade.