Region 1: EPA New England

2017 Ozone Exceedances

(Through December 31, 2017)

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)  
Danbury 08/22/17 0.072 Peak Ozone AQI
Stratford
Westport
08/10/17
08/10/17
0.073
0.075
Peak Ozone AQI
Danbury 08/03/17 0.075 Peak Ozone AQI
Greenwich
Madison
Middletown
New Haven
Stratford
Westport
07/20/17
07/20/17
07/20/17
07/20/17
07/20/17
07/20/17
0.084
0.076
0.076
0.079
0.081
0.090
Peak Ozone AQI
Madison
Middletown
New Haven
Stratford
Westport
07/19/17
07/19/17
07/19/17
07/19/17
07/19/17
0.076
0.072
0.074
0.076
0.073
Peak Ozone AQI
Danbury 07/18/17 0.072 Peak Ozone AQI
Groton
Madison
Stratford
07/12/17
07/12/17
07/12/17
0.075
0.086
0.077
Peak Ozone AQI
Madison 07/11/17 0.074 Peak Ozone AQI
Madison 07/08/17 0.071 Peak Ozone AQI
Madison 07/03/17 0.071 Peak Ozone AQI
Danbury
E. Hartford
06/30/17
06/30/17
0.074
0.071
Peak Ozone AQI
Danbury 06/22/17 0.072 Peak Ozone AQI
Madison
Stratford
06/21/17
06/21/17
0.075
0.074
Peak Ozone AQI
Greenwich
Groton
Madison
Middletown
Stratford
Westport
06/13/17
06/13/17
06/13/17
06/13/17
06/13/17
06/13/17
0.074
0.090
0.095
0.071
0.088
0.081
Peak Ozone AQI
Abington
Danbury
Groton
Madison
Middletown
New Haven
Stratford
Westport
06/12/17
06/12/17
06/12/17
06/12/17
06/12/17
06/12/17
06/12/17
06/12/17
0.079
0.071
0.081
0.097
0.085
0.089
0.095
0.097
Peak Ozone AQI
Abington
Groton
Madison
Middletown
New Haven
Stratford
Westport
06/11/17
06/11/17
06/11/17
06/11/17
06/11/17
06/11/17
06/11/17
0.075
0.078
0.080
0.079
0.075
0.080
0.079
Peak Ozone AQI
Danbury
E. Hartford
Groton
Middletown
Stafford
Stratford
Westport
06/10/17
06/10/17
06/10/17
06/10/17
06/10/17
06/10/17
06/10/17
0.072
0.072
0.071
0.076
0.072
0.072
0.075
Peak Ozone AQI
Groton
Madison
05/19/17
05/19/17
0.076
0.075
Peak Ozone AQI
Abington
Danbury
E. Hartford
Greenwich
Groton
Madison
Middletown
New Haven
Stafford
Stratford
Westport
05/18/17
05/18/17
05/18/17
05/18/17
05/18/17
05/18/17
05/18/17
05/18/17
05/18/17
05/18/17
05/18/17
0.079
0.072
0.075
0.086
0.090
0.090
0.086
0.085
0.077
0.091
0.090
Peak Ozone AQI
Abington
Cornwall
Danbury
E. Hartford
Greenwich
Middletown
Stafford
Stratford
Westport
05/17/17
05/17/17
05/17/17
05/17/17
05/17/17
05/17/17
05/17/17
05/17/17
05/17/17
0.082
0.077
0.078
0.078
0.074
0.081
0.084
0.071
0.073
Peak Ozone AQI

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Maine
Monitor Location Date Concentration (ppm)  
Acadia NP - Cadillac Mt
Acadia NP - McFarland Hill
Cape Elizabeth
Kennebunkport
Port Clyde
06/12/17
06/12/17
06/12/17
06/12/17
06/12/17
0.098
0.087
0.085
0.089
0.081
Peak Ozone AQI
Acadia NP - Cadillac Mt
Jonesport
Port Clyde
06/11/17
06/11/17
06/11/17
0.080
0.071
0.071
Peak Ozone AQI
Acadia NP - Cadillac Mt 06/10/17 0.071 Peak Ozone AQI
Acadia NP - Cadillac Mt
Acadia NP - McFarland Hill
Cape Elizabeth
Jonesport
Kennebunkport
Port Clyde
05/18/17
05/18/17
05/18/17
05/18/17
05/18/17
05/18/17
0.082
0.077
0.072
0.084
0.076
0.083
Peak Ozone AQI
Acadia NP - Cadillac Mt 05/17/17 0.078 Peak Ozone AQI
Acadia NP - Cadillac Mt 04/11/17 0.085 Peak Ozone AQI

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Massachusetts
Monitor Location Date Concentration (ppm)  
Chicopee 08/03/17 0.072 Peak Ozone AQI
Martha's Vineyard 07/21/17 0.076 Peak Ozone AQI
Martha's Vineyard 07/03/17 0.095 Peak Ozone AQI
Chicopee 06/30/17 0.072 Peak Ozone AQI
Fairhaven
Fall River
Martha's Vineyard
Truro
06/13/17
06/13/17
06/13/17
06/13/17
0.083
0.076
0.096
0.081
Peak Ozone AQI
Blue Hill
Boston
Brockton
Fairhaven
Fall River
Lynn
Martha's Vineyard
Truro
06/12/17
06/12/17
06/12/17
06/12/17
06/12/17
06/12/17
06/12/17
06/12/17
0.076
0.072
0.072
0.074
0.078
0.074
0.083
0.079
Peak Ozone AQI
Blue Hill
Brockton
Fall River
Lynn
Truro
06/11/17
06/11/17
06/11/17
06/11/17
06/11/17
0.075
0.074
0.073
0.071
0.072
Peak Ozone AQI
Fall River
Worcester
06/10/17
06/10/17
0.071
0.072
Peak Ozone AQI
Fairhaven
Truro
05/19/17
05/19/17
0.073
0.072
Peak Ozone AQI
Blue Hill
Boston
Brockton
Chicopee
Fairhaven
Fall River
Lynn
Truro
Uxbridge
Ware
Worcester
05/18/17
05/18/17
05/18/17
05/18/17
05/18/17
05/18/17
05/18/17
05/18/17
05/18/17
05/18/17
05/18/17
0.084
0.072
0.084
0.072
0.082
0.086
0.074
0.085
0.077
0.073
0.073
Peak Ozone AQI
Blue Hill
Boston
Brockton
Chelmsford
Chicopee
Lynn
Uxbridge
Ware
Worcester
05/17/17
05/17/17
05/17/17
05/17/17
05/17/17
05/17/17
05/17/17
05/17/17
05/17/17
0.083
0.076
0.073
0.072
0.074
0.081
0.083
0.077
0.076
Peak Ozone AQI
Ware 04/11/17 0.072 Peak Ozone AQI

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New Hampshire
Monitor Location Date Concentration (ppm)  
Odiorne State Park 06/12/17 0.074 Peak Ozone AQI
Summit of Mt Washington 04/30/17 0.078 Peak Ozone AQI
Londonderry
Miller State Park
04/11/17
04/11/17
0.071
0.071
Peak Ozone AQI
Summit of Mt Washington 03/18/17 0.081
Summit of Mt Washington 03/17/17 0.080

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Rhode Island
Monitor Location Date Concentration (ppm)  
Narragansett
W. Greenwich
06/13/17
06/13/17
0.086
0.076
Peak Ozone AQI
E. Providence
Narragansett
W. Greenwich
06/12/17
06/12/17
06/12/17
0.082
0.079
0.077
Peak Ozone AQI
E. Providence
W. Greenwich
06/11/17
06/11/17
0.075
0.076
Peak Ozone AQI
Narragansett
W. Greenwich
06/10/17
06/10/17
0.071
0.072
Peak Ozone AQI
Narragansett 05/19/17 0.073 Peak Ozone AQI
E. Providence
Narragansett
W. Greenwich
05/18/17
05/18/17
05/18/17
0.085
0.080
0.080
Peak Ozone AQI
E. Providence 05/17/17 0.076 Peak Ozone AQI

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Vermont
Monitor Location Date Concentration (ppm)  
Bennington 04/10/17 0.071 Peak Ozone AQI

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