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EPA Region 1
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2022 Ozone Exceedances

(Through December 31, 2022)

Below are the exceedances of the 0.070 parts per million (ppm) eight-hour average ozone standard, and the dates they occurred for each ozone monitor in New England. These data are preliminary, not quality assured and are subject to change.

  • Connecticut
  • Maine
  • Massachusetts
  • New Hampshire
  • Rhode Island
  • Vermont
Connecticut
Monitor Location Date Concentration (ppm) AQI Map
Cornwall August 20, 2022 0.073 Peak Ozone AQI
Greenwich August 20, 2022 0.076
Stratford August 20, 2022 0.072
Westport August 20, 2022 0.076
Greenwich August 19, 2022 0.072 Peak Ozone AQI
Madison August 9, 2022 0.077 Peak Ozone AQI
Groton August 9, 2022 0.073
Stratford August 9, 2022 0.073
Danbury August 6, 2022 0.071 Peak Ozone AQI
East Hartford August 5, 2022 0.075 Peak Ozone AQI
Groton August 5, 2022 0.071
Madison August 5, 2022 0.072
Middletown August 5, 2022 0.080
New Haven August 5, 2022 0.080
Stratford August 5, 2022 0.085
Westport August 5, 2022 0.088
Cornwall August 4, 2022 0.071 Peak Ozone AQI
Danbury August 4, 2022 0.076
East Hartford August 4, 2022 0.077
Greenwich August 4, 2022 0.079
Middletown August 4, 2022 0.084
New Haven August 4, 2022 0.077
Stafford August 4, 2022 0.077
Stratford August 4, 2022 0.081
Westport August 4, 2022 0.081
Greenwich August 3, 2022 0.074 Peak Ozone AQI
Greenwich August 2, 2022 0.077 Peak Ozone AQI
Madison August 2, 2022 0.076
Middletown August 2, 2022 0.073
New Haven August 2, 2022 0.071
Stratford August 2, 2022 0.082
Westport August 2, 2022 0.080
Danbury July 28, 2022 0.075 Peak Ozone AQI
Greenwich July 28, 2022 0.075
Groton July 24, 2022 0.073 Peak Ozone AQI
Madison July 24, 2022 0.077
Middletown July 24, 2022 0.071
Stratford July 24, 2022 0.074
Westport July 24, 2022 0.073
Greenwich July 23, 2022 0.073 Peak Ozone AQI
Stratford July 23, 2022 0.071
Westport July 23, 2022 0.074
Greenwich July 22, 2022 0.074 Peak Ozone AQI
Stratford July 22, 2022 0.076
Westport July 22, 2022 0.073
Danbury July 21, 2022 0.076 Peak Ozone AQI
Greenwich July 20, 2022 0.085 Peak Ozone AQI
Groton July 20, 2022 0.072
Madison July 20, 2022 0.078
New Haven July 20, 2022 0.072
Stratford July 20, 2022 0.086
Westport July 20, 2022 0.082
Greenwich July 13, 2022 0.076 Peak Ozone AQI
Westport July 13, 2022 0.073
Danbury July 12, 2022 0.072 Peak Ozone AQI
Middletown July 8, 2022 0.071 Peak Ozone AQI
Danbury July 1, 2022 0.075 Peak Ozone AQI
East Hartford July 1, 2022 0.081
Middletown July 1, 2022 0.074
Stafford July 1, 2022 0.074
Westport July 1, 2022 0.073
Greenwich June 30, 2022 0.073 Peak Ozone AQI
Westport June 30, 2022 0.071
Greenwich June 29, 2022 0.071 Peak Ozone AQI
Westport June 29, 2022 0.071
Danbury June 26, 2022 0.071 Peak Ozone AQI
East Hartford June 26, 2022 0.074
New Haven June 26, 2022 0.072
Stratford June 26, 2022 0.074
Westport June 26, 2022 0.082
Westport May 22, 2022 0.071 Peak Ozone AQI
Cornwall May 21, 2022 0.071 Peak Ozone AQI
Maine
Monitor Location Date Concentration (ppm) AQI Map
Cape Elizabeth July 20, 2022 0.072 Peak Ozone AQI
Kennebunkport July 20, 2022 0.078
Bar Harbor - Cadillac Mtn July 1, 2022 0.074 Peak Ozone AQI
Cape Elizabeth July 1, 2022 0.072
Kennebunkport July 1, 2022 0.074
Portland July 1, 2022 0.071
Massachusetts
Monitor Location Date Concentration (ppm) AQI Map
Boston - Roxbury August 20, 2022 0.071 Peak Ozone AQI
Chicopee August 20, 2022 0.075
Haverhill August 20, 2022 0.074
Boston - Roxbury July 24, 2022 0.074 Peak Ozone AQI
Lynn July 24, 2022 0.071
Milton - Blue Hill July 24, 2022 0.071
Weymouth July 24, 2022 0.073
Lynn July 23, 2022 0.073 Peak Ozone AQI
Martha's Vineyard July 23, 2022 0.078
Fairhaven July 20, 2022 0.073 Peak Ozone AQI
Fall River July 20, 2022 0.075
Lynn July 20, 2022 0.073
New Hampshire
Monitor Location Date Concentration (ppm) AQI Map
Odiorne State Park July 20, 2022 0.077 Peak Ozone AQI
Odiorne State Park July 1, 2022 0.074 Peak Ozone AQI
Portsmouth July 1, 2022 0.071
Rhode Island
Monitor Location Date Concentration (ppm) AQI Map
East Providence July 24, 2022 0.073 Peak Ozone AQI
East Matunuck July 23, 2022 0.085 Peak Ozone AQI
East Matunuck July 22, 2022 0.075 Peak Ozone AQI
East Matunuck July 20, 2022 0.091 Peak Ozone AQI
Narragansett July 20, 2022 0.079
East Matunuck June 25, 2022 0.078 Peak Ozone AQI
Vermont
Monitor Location Date Concentration (ppm) AQI Map
None      

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Last updated on January 18, 2023