Region 1: EPA New England

2018 Ozone Exceedances

(Through August 8, 2018)

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 8/8/2018 0.084 Peak Ozone AQI
New Haven 8/8/2018 0.072
Stratford 8/8/2018 0.078
Westport 8/8/2018 0.084
Danbury 8/7/2018 0.072 Peak Ozone AQI
Stafford 8/7/2018 0.071
Greenwich 8/6/2018 0.086 Peak Ozone AQI
Stratford 8/6/2018 0.074
Westport 8/6/2018 0.077
Greenwich 7/28/2018 0.079 Peak Ozone AQI
Cornwall 7/16/2018 0.075 Peak Ozone AQI
Danbury 7/16/2018 0.081
Greenwich 7/16/2018 0.081
Madison 7/16/2018 0.073
Middletown 7/16/2018 0.073
New Haven 7/16/2018 0.085
Stratford 7/16/2018 0.080
Westport 7/16/2018 0.077
Greenwich 7/14/2018 0.077 Peak Ozone AQI
Stratford 7/14/2018 0.072
Westport 7/14/2018 0.077
Greenwich 7/13/2018 0.072 Peak Ozone AQI
Abington 7/10/2018 0.072 Peak Ozone AQI
Greenwich 7/10/2018 0.095
Groton 7/10/2018 0.082
Madison 7/10/2018 0.086
Middletown 7/10/2018 0.077
New Haven 7/10/2018 0.088
Stratford 7/10/2018 0.099
Westport 7/10/2018 0.094
Greenwich 7/9/2018 0.086 Peak Ozone AQI
Madison 7/9/2018 0.075
Middletown 7/9/2018 0.073
Stratford 7/9/2018 0.077
Westport 7/9/2018 0.080
Cornwall 7/2/2018 0.080 Peak Ozone AQI
Danbury 7/2/2018 0.092
Greenwich 7/2/2018 0.072
Groton 7/2/2018 0.081
Madison 7/2/2018 0.071
Stratford 7/2/2018 0.072
Madison 7/1/2018 0.077 Peak Ozone AQI
Stratford 7/1/2018 0.075
Danbury 6/30/2018 0.074 Peak Ozone AQI
Danbury 6/18/2018 0.082 Peak Ozone AQI
E. Hartford 6/18/2018 0.083
Greenwich 6/18/2018 0.074
Middletown 6/18/2018 0.074
Stafford 6/18/2018 0.082
Madison 6/17/2018 0.072 Peak Ozone AQI
Greenwich 5/26/2018 0.077 Peak Ozone AQI
Groton 5/26/2018 0.074
Madison 5/26/2018 0.080
New Haven 5/26/2018 0.082
Stratford 5/26/2018 0.083
Westport 5/26/2018 0.084
Cornwall 5/25/2018 0.071 Peak Ozone AQI
Danbury 5/25/2018 0.072
Madison 5/25/2018 0.071
Stafford 5/25/2018 0.071
Westport 5/25/2018 0.075
Abington 5/3/2018 0.076 Peak Ozone AQI
Middletown 5/3/2018 0.077
Abington 5/2/2018 0.079 Peak Ozone AQI
Cornwall 5/2/2018 0.072
Danbury 5/2/2018 0.075
Greenwich 5/2/2018 0.071
Groton 5/2/2018 0.075
Madison 5/2/2018 0.071
Middletown 5/2/2018 0.078
Stafford 5/2/2018 0.073
Westport 5/2/2018 0.071

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Maine
Monitor Location Date Concentration (ppm)  
Kennebunkport 8/7/2018 0.073 Peak Ozone AQI
Kennebunkport 7/10/2018 0.076 Peak Ozone AQI
Acadia NP – McFarland Hill 5/2/2018 0.077 Peak Ozone AQI
Bar Harbor – Cadillac Mtn. 5/2/2018 0.077
Jonesport 5/2/2018 0.077
Port Clyde 5/2/2018 0.074

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Massachusetts
Monitor Location Date Concentration (ppm)  
Fall River 8/6/2018 0.071 Peak Ozone AQI
Martha's Vineyard 8/6/2018 0.073
Chicopee 7/16/2018 0.074 Peak Ozone AQI
Fall River 7/16/2018 0.074
Blue Hill 7/10/2018 0.075 Peak Ozone AQI
Brockton 7/10/2018 0.072
Fall River 7/10/2018 0.080
Lynn 7/10/2018 0.072
Uxbridge 7/10/2018 0.071
Martha's Vineyard 7/1/2018 0.073 Peak Ozone AQI
Chicopee 6/18/2018 0.078 Peak Ozone AQI
Ware 6/18/2018 0.077
Worcester 6/18/2018 0.075
Fall River 6/17/2018 0.075 Peak Ozone AQI
Fall River 5/26/2018 0.075 Peak Ozone AQI
Lynn 5/26/2018 0.071
Truro 5/26/2018 0.071
Brockton 5/25/2018 0.074 Peak Ozone AQI
Fall River 5/25/2018 0.074
Lynn 5/25/2018 0.074
Truro 5/25/2018 0.076
Uxbridge 5/25/2018 0.074
Worcester 5/25/2018 0.071
Blue Hill 5/2/2018 0.072 Peak Ozone AQI
Brockton 5/2/2018 0.078
Boston 5/2/2018 0.073
Fairhaven 5/2/2018 0.074
Fall River 5/2/2018 0.080
Lynn 5/2/2018 0.075
Martha's Vineyard 5/2/2018 0.071
Truro 5/2/2018 0.080
Uxbridge 5/2/2018 0.079
Ware 5/2/2018 0.071

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New Hampshire
Monitor Location Date Concentration (ppm)  
Rye 8/7/2018 0.071 Peak Ozone AQI
Rye 7/10/2018 0.075 Peak Ozone AQI
Londonderry 5/26/2018 0.072 Peak Ozone AQI
Summit of Mt Washington 5/18/2018 0.075* Peak Ozone AQI
Summit of Mt Washington 4/14/2018 0.071* Peak Ozone AQI

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Rhode Island
Monitor Location Date Concentration (ppm)  
Narragansett 8/2/2018 0.072 Peak Ozone AQI
E. Providence 7/16/2018 0.076 Peak Ozone AQI
E. Providence 7/10/2018 0.083 Peak Ozone AQI
Narragansett 7/10/2018 0.075
W. Greenwich 7/10/2018 0.074
E. Providence 7/2/2018 0.072 Peak Ozone AQI
Narragansett 7/1/2018 0.071 Peak Ozone AQI
E. Providence 6/17/2018 0.071 Peak Ozone AQI
Narragansett 6/17/2018 0.071
E. Providence 5/26/2018 0.080 Peak Ozone AQI
Narragansett 5/26/2018 0.071
W. Greenwich 5/26/2018 0.076
E. Providence 5/25/2018 0.084 Peak Ozone AQI
W. Greenwich 5/25/2018 0.080
W. Greenwich 5/3/2018 0.073 Peak Ozone AQI
E. Providence 5/2/2018 0.079 Peak Ozone AQI
W. Greenwich 5/2/2018 0.081

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Vermont
Monitor Location Date Concentration (ppm)  
Bennington 05/25/2018 0.071 Peak Ozone AQI

* Possible Exceptional Event

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