Region 1: EPA New England

2019 Ozone Exceedances

(Through September 15, 2019)

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)  
Abington 8/30/2019 0.072 Peak Ozone AQI
Middletown 8/30/2019 0.076
Stratford 8/30/2019 0.071
Westport 8/30/2019 0.073
New Haven 8/19/2019 0.071 Peak Ozone AQI
Stratford 8/19/2019 0.072
Groton 8/8/2019 0.076 Peak Ozone AQI
Madison 8/8/2019 0.084
Stratford 8/8/2019 0.080
Greenwich 7/31/2019 0.076 Peak Ozone AQI
Danbury 7/30/2019 0.075 Peak Ozone AQI
E. Hartford 7/30/2019 0.072
Greenwich 7/30/2019 0.084
Groton 7/30/2019 0.073
Madison 7/30/2019 0.077
Middletown 7/30/2019 0.076
Stafford 7/30/2019 0.073
Stratford 7/30/2019 0.077
Westport 7/30/2019 0.079
Greenwich 7/29/2019 0.084 Peak Ozone AQI
Groton 7/29/2019 0.074
Madison 7/29/2019 0.086
Middletown 7/29/2019 0.082
New Haven 7/29/2019 0.083
Stratford 7/29/2019 0.087
Westport 7/29/2019 0.088
Greenwich 7/28/2019 0.071 Peak Ozone AQI
Groton 7/28/2019 0.075
Madison 7/28/2019 0.084
Middletown 7/28/2019 0.073
New Haven 7/28/2019 0.081
Stratford 7/28/2019 0.083
Westport 7/28/2019 0.081
Madison 7/27/2019 0.075 Peak Ozone AQI
Madison 7/20/2019 0.075 Peak Ozone AQI
E. Hartford 7/19/2019 0.077 Peak Ozone AQI
Middletown 7/19/2019 0.077
New Haven 7/19/2019 0.071
Stafford 7/19/2019 0.078
Westport 7/19/2019 0.072
Westport 7/17/2019 0.074 Peak Ozone AQI
Danbury 7/16/2019 0.075 Peak Ozone AQI
E. Hartford 7/16/2019 0.077
Greenwich 7/16/2019 0.086
Middletown 7/16/2019 0.087
New Haven 7/16/2019 0.089
Stafford 7/16/2019 0.075
Stratford 7/16/2019 0.084
Westport 7/16/2019 0.090
Greenwich 7/10/2019 0.072 Peak Ozone AQI
Groton 7/10/2019 0.075
Madison 7/10/2019 0.079
Greenwich 7/4/2019 0.086 Peak Ozone AQI
Groton 7/4/2019 0.079
Madison 7/4/2019 0.077
New Haven 7/4/2019 0.072
Stratford 7/4/2019 0.082
Westport 7/4/2019 0.084
Groton 6/29/2019 0.079 Peak Ozone AQI
Madison 6/29/2019 0.084
Stratford 6/29/2019 0.076
Westport 6/29/2019 0.073
Greenwich 6/28/2019 0.072 Peak Ozone AQI
Madison 6/28/2019 0.071
Madison 6/27/2019 0.072 Peak Ozone AQI
Stratford 6/26/2019 0.071 Peak Ozone AQI
Westport 6/26/2019 0.071
Danbury 6/5/2019 0.071 Peak Ozone AQI

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Maine
Monitor Location Date Concentration (ppm)  
Acadia NP - Cadillac Mtn. 07/30/2019 0.072 Peak Ozone AQI
Kennebunkport 07/30/2019 0.075

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Massachusetts
Monitor Location Date Concentration (ppm)  
Martha's Vineyard 8/22/2019 0.071 Peak Ozone AQI
Lynn 7/30/2019 0.077 Peak Ozone AQI
Martha's Vineyard 7/21/2019 0.075 Peak Ozone AQI
Martha's Vineyard 7/20/2019 0.078 Peak Ozone AQI
Martha's Vineyard 7/14/2019 0.074 Peak Ozone AQI

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New Hampshire
Monitor Location Date Concentration (ppm)  
Rye 7/30/2019 0.074 Peak Ozone AQI

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Rhode Island
Monitor Location Date Concentration (ppm)  
Narragansett 7/10/2019 0.078 Peak Ozone AQI
Narragansett 6/29/2019 0.073 Peak Ozone AQI

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Vermont
Monitor Location Date Concentration (ppm)  
None None    

* Possible Exceptional Event

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