Region 1: EPA New England

2020 Ozone Exceedances

(Through September 30, 2020)

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
Monitor Location Date Concentration (ppm)  
Greenwich August 24, 2020 0.074 Peak Ozone AQI
New Haven August 24, 2020 0.078
Stratford August 24, 2020 0.073
Madison August 22, 2020 0.071 Peak Ozone AQI
Middletown August 21, 2020 0.071 Peak Ozone AQI
Stratford August 10, 2020 0.071 Peak Ozone AQI
Groton August 5, 2020 0.077 Peak Ozone AQI
Madison August 5, 2020 0.085
Stratford August 5, 2020 0.076
Madison August 3, 2020 0.072 Peak Ozone AQI
Stratford August 3, 2020 0.074
Greenwich July 30, 2020 0.090 Peak Ozone AQI
Groton July 30, 2020 0.094
Madison July 30, 2020 0.095
New Haven July 30, 2020 0.076
Stratford July 30, 2020 0.087
Westport July 30, 2020 0.077
Madison July 28, 2020 0.080 Peak Ozone AQI
Groton July 27, 2020 0.076 Peak Ozone AQI
Madison July 27, 2020 0.088
Stratford July 27, 2020 0.080
Westport July 27, 2020 0.073
Madison July 26, 2020 0.071 Peak Ozone AQI
Madison July 25, 2020 0.071 Peak Ozone AQI
Westport July 25, 2020 0.077
Greenwich July 21, 2020 0.077 Peak Ozone AQI
Westport July 21, 2020 0.072
Madison July 20, 2020 0.075 Peak Ozone AQI
Greenwich July 19, 2020 0.081 Peak Ozone AQI
Madison July 19, 2020 0.071
Middletown July 19, 2020 0.079
New Haven July 19, 2020 0.082
Stratford July 19, 2020 0.083
Westport July 19, 2020 0.083
Groton July 13, 2020 0.071 Peak Ozone AQI
Madison July 13, 2020 0.075
Danbury June 9, 2020 0.071 Peak Ozone AQI
Greenwich June 9, 2020 0.083
Madison June 9, 2020 0.071
Stratford June 9, 2020 0.073
Westport June 9, 2020 0.073
Greenwich June 4, 2020 0.075 Peak Ozone AQI

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Maine
Monitor Location Date Concentration (ppm)  
Bar Harbor - Cadillac Mtn. June 27, 2020 0.072 Peak Ozone AQI

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Massachusetts
Monitor Location Date Concentration (ppm)  
Fairhaven July 30, 2020 0.071 Peak Ozone AQI
Fairhaven July 28, 2020 0.072 Peak Ozone AQI
Truro July 28, 2020 0.071
Fairhaven July 27, 2020 0.076 Peak Ozone AQI
Fall River July 27, 2020 0.073
Martha's Vineyard July 27, 2020 0.078
Truro July 27, 2020 0.073

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New Hampshire
Monitor Location Date Concentration (ppm)  
       

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Rhode Island
Monitor Location Date Concentration (ppm)  
East Providence August 5, 2020 0.074 Peak Ozone AQI
East Providence July 30, 2020 0.073 Peak Ozone AQI
West Greenwich July 30, 2020 0.080
East Matunuck July 28, 2020 0.071 Peak Ozone AQI
Narragansett July 28, 2020 0.074
East Matunuck July 27, 2020 0.087 Peak Ozone AQI
Narragansett July 27, 2020 0.077

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Vermont
Monitor Location Date Concentration (ppm)  
       

* Possible Exceptional Event

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