Region 1: EPA New England
Connecticut
For 1999 and after, click on the date for the corresponding eight-hour average peak ozone map for that day.
In March 2008, EPA revised the 8-hour ozone standard and changed the Air Quality Index (AQI) to align with this new standard. Maps for days in 2007 and earlier are based on the 1997 8-hour ozone standard. Maps for 2008 are based on the new 2008 ozone standard and the revised AQI. Click Here for a table showing the revised AQI breakpoints for the 2008 ozone standard.
Bridgeport | Cornwall | Danbury | Greenwich | Groton | E. Hartford | Hamden | Madison | Middletown | New Haven | Stafford | Stratford | Torrington | Westport
Bridgeport
Operating from 1988 to 1997 |
||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Year | # Days > | 1st High (ppm) | Date | 2nd High (ppm) | Date | 3rd High (ppm) | Date | 4th High (ppm) | Date | |
| 0.084 | 0.075 | |||||||||
| 1994 | 3 | 6 | 0.117 | June 18 | 0.093 | July 2 | 0.092 | July 13 | 0.082 | July 6 |
| 1995 | 5 | 9 | 0.103 | June 18 | 0.102 | Aug 1 | 0.101 | Aug 2 | 0.087 | Aug 21 |
| 1996 | 0 | 4 | 0.082 | July 6 | 0.081 | July 18 | 0.080 | Aug 4 | 0.079 | Aug 23 |
| 1997 | 4 | 10 | 0.101 | July 15 | 0.097 | June 29 | 0.095 | June 21 | 0.089 | July 14 |
Cornwall
Operating from 2002 to Present |
||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Year | # Days > | 1st High (ppm) | Date | 2nd High (ppm) | Date | 3rd High (ppm) | Date | 4th High (ppm) | Date | |
| 0.084 | 0.075 | |||||||||
| 2002 | 15 | 24 | 0.121 | Aug 13 | 0.117 | Aug 14 | 0.101 | July 22 | 0.099 | Aug 11 |
| 2003 | 4 | 11 | 0.098 | June 25 | 0.091 | June 26 | 0.087 | July 2 | 0.085 | April 15 |
| 2004 | 2 | 7 | 0.099 | July 22 | 0.086 | June 24 | 0.084 | Aug 10 | 0.083 | May 13 |
| 2005 | 8 | 11 | 0.099 | June 9 | 0.096 | Aug 12 | 0.095 | June 25 | 0.094 | July 26 |
| 2006 | 4 | 13 | 0.100 | June 19 | 0.094 | June 18 | 0.089 | June 22 | 0.085 | July 10 |
| 2007 | 6 | 20 | 0.123 | July 9 | 0.095 | June 25 | 0.091 | Aug 30 | 0.089 | Sept 26 |
| 2008 | 1 | 4 | 0.090 | April 19 | 0.081 | June 10 | 0.079 | April 18 | 0.077 | June 13 |
| 2009 | 0 | 0 | 0.074 | April 27 | 0.074 | May 22 | 0.072 | June 7 | 0.070 | May 21 |
| 2010 | 1 | 2 | 0.087 | May 1 | 0.083 | Sep 2 | 0.074 | Sep 1 | 0.072 | July 12 |
| 2011 | 0 | 1 | 0.085 | July 21 | 0.074 | June 21 | 0.070 | June 7 | 0.069 | July 11 |
Danbury
Operating from 1982 to Present |
||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Year | # Days > | 1st High (ppm) | Date | 2nd High (ppm) | Date | 3rd High (ppm) | Date | 4th High (ppm) | Date | |
| 0.084 | 0.075 | |||||||||
| 1994 | 10 | 15 | 0.102 | July 2 | 0.100 | Aug 9 | 0.096 | Aug 4 | 0.093 | June 17 |
| 1995 | 8 | 14 | 0.122 | July 13 | 0.097 | Aug 1 | 0.094 | July 4 | 0.093 | June 30 |
| 1996 | 1 | 9 | 0.085 | Aug 23 | 0.084 | July 14 | 0.082 | July 6 | 0.081 | Aug 26 |
| 1997 | 14 | 19 | 0.112 | June 30 | 0.107 | June 25 | 0.106 | July 27 | 0.105 | Aug 10 |
| 1998 | 9 | 16 | 0.102 | Aug 24 | 0.094 | Aug 23 | 0.092 | May 29 | 0.092 | July 15 |
| 1999 | 17 | 22 | 0.115 | July 17 | 0.111 | July 16 | 0.111 | July 29 | 0.106 | May 31 |
| 2000 | 7 | 9 | 0.097 | June 10 | 0.096 | June 2 | 0.092 | June 26 | 0.090 | June 24 |
| 2001 | 9 | 22 | 0.112 | June 19 | 0.107 | June 20 | 0.098 | Aug 2 | 0.096 | July 22 |
| 2002 | 18 | 26 | 0.121 | Aug 13 | 0.120 | Aug 14 | 0.110 | Aug 2 | 0.109 | June 11 |
| 2003 | 4 | 12 | 0.103 | June 25 | 0.088 | June 29 | 0.086 | June 26 | 0.085 | July 2 |
| 2004 | 4 | 7 | 0.098 | July 22 | 0.092 | June 8 | 0.086 | June 24 | 0.086 | Aug 20 |
| 2005 | 11 | 16 | 0.110 | June 26 | 0.109 | Aug 12 | 0.106 | July 27 | 0.104 | July 26 |
| 2006 | 4 | 13 | 0.103 | June 18 | 0.098 | June 19 | 0.088 | July 26 | 0.087 | June 22 |
| 2007 | 9 | 18 | 0.108 | July 9 | 0.100 | Aug 3 | 0.098 | July 10 | 0.092 | June 26 |
| 2008 | 5 | 9 | 0.093 | June 28 | 0.091 | June 10 | 0.088 | April 19 | 0.086 | June 14 |
| 2009 | 0 | 3 | 0.083 | May 22 | 0.080 | Aug 18 | 0.076 | July 16 | 0.074 | Aug 4 |
| 2010 | 3 | 7 | 0.097 | Sep 2 | 0.091 | July 16 | 0.088 | May 1 | 0.084 | June 27 |
| 2011 | 2 | 6 | 0.089 | July 21 | 0.086 | June 9 | 0.083 | June 21 | 0.083 | July 6 |
Greenwich
Operating from 1982 to Present |
||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Year | # Days > | 1st High (ppm) | Date | 2nd High (ppm) | Date | 3rd High (ppm) | Date | 4th High (ppm) | Date | |
| 0.084 | 0.075 | |||||||||
| 1994 | 14 | 21 | 0.129 | July 6 | 0.116 | June 18 | 0.111 | July 7 | 0.107 | July 13 |
| 1995 | 8 | 19 | 0.122 | July 14 | 0.108 | Aug 1 | 0.106 | Aug 2 | 0.102 | June 19 |
| 1996 | 7 | 14 | 0.104 | July 18 | 0.099 | Aug 4 | 0.098 | Aug 5 | 0.093 | Aug 6 |
| 1997 | 13 | 20 | 0.138 | July 15 | 0.118 | July 14 | 0.103 | June 21 | 0.101 | July 17 |
| 1998 | 8 | 23 | 0.097 | Aug 24 | 0.092 | June 25 | 0.089 | July 4 | 0.089 | Aug 23 |
| 1999 | 14 | 17 | 0.119 | July 16 | 0.114 | July 18 | 0.113 | July 17 | 0.107 | July 24 |
| 2000 | 3 | 11 | 0.113 | June 10 | 0.095 | June 2 | 0.085 | May 7 | 0.084 | June 1 |
| 2001 | 13 | 22 | 0.131 | Aug 7 | 0.117 | Aug 9 | 0.107 | July 25 | 0.098 | June 19 |
| 2002 | 19 | 26 | 0.120 | Aug 13 | 0.110 | July 18 | 0.106 | July 2 | 0.103 | June 11 |
| 2003 | 7 | 15 | 0.124 | June 26 | 0.106 | June 25 | 0.105 | June 24 | 0.099 | Aug 21 |
| 2004 | 1 | 3 | 0.085 | June 9 | 0.084 | July 22 | 0.079 | June 8 | 0.075 | July 2 |
| 2005 | 8 | 17 | 0.110 | Aug 13 | 0.099 | Aug 11 | 0.093 | July 27 | 0.089 | July 26 |
| 2006 | 5 | 11 | 0.100 | July 17 | 0.099 | June 18 | 0.099 | July 18 | 0.097 | Aug 1 |
| 2007 | 3 | 10 | 0.093 | July 17 | 0.090 | June 26 | 0.085 | June 1 | 0.084 | June 27 |
| 2008 | 5 | 14 | 0.105 | June 10 | 0.102 | July 18 | 0.090 | July 19 | 0.088 | June 7 |
| 2009 | 0 | 1 | 0.079 | Aug 15 | 0.073 | July 16 | 0.072 | Aug 4 | 0.068 | Aug 10 |
| 2010 | 1 | 7 | 0.091 | Sep 1 | 0.082 | July 12 | 0.082 | Aug 17 | 0.079 | July 7 |
| 2011 | 3 | 8 | 0.093 | June 8 | 0.087 | June 7 | 0.086 | July 7 | 0.081 | Aug 20 |
Groton
Operating from 1985 to Present, Relocated 2007 |
||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Year | # Days > | 1st High (ppm) | Date | 2nd High (ppm) | Date | 3rd High (ppm) | Date | 4th High (ppm) | Date | |
| 0.084 | 0.075 | |||||||||
| 1994 | 5 | 14 | 0.105 | July 13 | 0.096 | July 7 | 0.094 | July 16 | 0.093 | July 27 |
| 1995 | 8 | 10 | 0.119 | July 19 | 0.113 | Aug 21 | 0.113 | July 14 | 0.101 | June 18 |
| 1996 | 6 | 12 | 0.120 | July 18 | 0.098 | May 20 | 0.097 | July 6 | 0.095 | June 14 |
| 1997 | 17 | 23 | 0.153 | July 15 | 0.125 | July 14 | 0.107 | June 25 | 0.104 | Aug 2 |
| 1998 | 3 | 10 | 0.109 | June 26 | 0.090 | Sept 6 | 0.089 | Aug 27 | 0.083 | Aug 4 |
| 1999 | 11 | 20 | 0.132 | June 7 | 0.104 | June 23 | 0.103 | July 6 | 0.096 | May 30 |
| 2000 | 3 | 10 | 0.124 | June 10 | 0.105 | June 11 | 0.085 | May 9 | 0.084 | Aug 8 |
| 2001 | 7 | 15 | 0.099 | Aug 7 | 0.095 | Aug 1 | 0.090 | Aug 2 | 0.090 | Aug 8 |
| 2002 | 7 | 14 | 0.127 | July 2 | 0.114 | July 18 | 0.102 | July 1 | 0.095 | Aug 13 |
| 2003 | 5 | 11 | 0.113 | June 26 | 0.112 | June 27 | 0.104 | June 25 | 0.095 | July 5 |
| 2004 | 1 | 3 | 0.095 | June 9 | 0.079 | May 12 | 0.077 | June 8 | 0.075 | May 12 |
| 2005 | 4 | 10 | 0.093 | Sept 12 | 0.088 | June 8 | 0.086 | April 20 | 0.085 | Aug 11 |
| 2006 | 4 | 7 | 0.110 | July 18 | 0.100 | Aug 2 | 0.092 | Aug 3 | 0.090 | Aug 1 |
| 2007 | 4 | 5 | 0.095 | May 25 | 0.090 | July 8 | 0.089 | June 28 | 0.089 | Aug 3 |
| 2008 | 2 | 6 | 0.094 | July 19 | 0.093 | June 10 | 0.081 | July 17 | 0.080 | July 18 |
| 2009 | 0 | 1 | 0.083 | Aug 18 | 0.075 | Aug 15 | 0.074 | Aug 26 | 0.073 | Aug 17 |
| 2010 | 0 | 3 | 0.078 | June 24 | 0.078 | Sep 1 | 0.076 | June 5 | 0.075 | July 17 |
| 2011 | 2 | 9 | 0.088 | July 22 | 0.085 | July 23 | 0.083 | July 18 | 0.082 | June 7 |
E. Hartford
Operating from 1982 to Present |
||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Year | # Days > | 1st High (ppm) | Date | 2nd High (ppm) | Date | 3rd High (ppm) | Date | 4th High (ppm) | Date | |
| 0.084 | 0.075 | |||||||||
| 1994 | 14 | 19 | 0.135 | June 18 | 0.103 | July 2 | 0.103 | Aug 9 | 0.099 | July 20 |
| 1995 | 8 | 13 | 0.113 | July 13 | 0.108 | June 30 | 0.097 | July 4 | 0.095 | July 14 |
| 1996* | 0 | 3 | 0.081 | July 6 | 0.079 | July 8 | 0.076 | June 13 | 0.075 | May 19 |
| 1997 | 7 | 11 | 0.137 | June 25 | 0.124 | June 21 | 0.098 | June 30 | 0.097 | Aug 10 |
| 1998 | 2 | 10 | 0.103 | Aug 24 | 0.095 | July 17 | 0.084 | Aug 6 | 0.082 | July 17 |
| 1999 | 11 | 16 | 0.105 | July 17 | 0.099 | July 16 | 0.095 | June 1 | 0.094 | July 29 |
| 2000 | 2 | 4 | 0.097 | June 10 | 0.087 | July 3 | 0.079 | June 26 | 0.078 | June 9 |
| 2001 | 8 | 15 | 0.114 | June 20 | 0.102 | June 19 | 0.096 | July 23 | 0.093 | Aug 9 |
| 2002 | 11 | 16 | 0.126 | Aug 13 | 0.104 | Aug 14 | 0.100 | Aug 11 | 0.100 | Aug 12 |
| 2003 | 0 | 5 | 0.084 | June 26 | 0.083 | June 25 | 0.077 | June 27 | 0.077 | July 4 |
| 2004 | 1 | 5 | 0.087 | July 22 | 0.082 | June 17 | 0.077 | May 15 | 0.077 | June 8 |
| 2005 | 5 | 12 | 0.103 | July 27 | 0.095 | July 26 | 0.091 | June 9 | 0.088 | June 8 |
| 2006 | 4 | 6 | 0.111 | June 18 | 0.098 | June 19 | 0.087 | June 22 | 0.086 | May 29 |
| 2007 | 5 | 9 | 0.107 | Aug 3 | 0.100 | July 9 | 0.097 | June 27 | 0.097 | July 10 |
| 2008 | 2 | 4 | 0.089 | June 10 | 0.086 | June 7 | 0.080 | June 28 | 0.080 | July 3 |
| 2009 | 0 | 1 | 0.076 | April 28 | 0.073 | May 22 | 0.071 | Aug 18 | 0.066 | April 25 |
| 2010 | 1 | 4 | 0.089 | Sep 2 | 0.079 | July 28 | 0.077 | July 16 | 0.076 | June 27 |
| 2011 | 1 | 3 | 0.092 | July 21 | 0.081 | June 21 | 0.080 | July 11 | 0.072 | June 6 |
|
*Site did not meet 75% minimum data completeness requirement |
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Hamden
Operating from 1999 to 2003 |
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|---|---|---|---|---|---|---|---|---|---|---|
| Year | # Days > | 1st High (ppm) | Date | 2nd High (ppm) | Date | 3rd High (ppm) | Date | 4th High (ppm) | Date | |
| 0.084 | 0.075 | |||||||||
| 1999 | 11 | 18 | 0.117 | July 24 | 0.115 | July 17 | 0.109 | July 16 | 0.105 | July 18 |
| 2000 | 2 | 7 | 0.104 | June 10 | 0.088 | May 7 | 0.083 | May 9 | 0.081 | June 2 |
| 2001 | 9 | 15 | 0.110 | Aug 9 | 0.104 | June 30 | 0.102 | Aug 7 | 0.101 | July 25 |
| 2002 | 16 | 24 | 0.124 | Aug 13 | 0.122 | July 9 | 0.106 | Aug 12 | 0.103 | July 18 |
| 2003 | 7 | 9 | 0.105 | July 4 | 0.096 | June 25 | 0.092 | July 26 | 0.091 | June 24 |
Madison
Operating from 1982 to Present |
||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Year | # Days > | 1st High (ppm) | Date | 2nd High (ppm) | Date | 3rd High (ppm) | Date | 4th High (ppm) | Date | |
| 0.084 | 0.075 | |||||||||
| 1994 | 13 | 18 | 0.123 | July 13 | 0.115 | June 18 | 0.097 | Aug 9 | 0.093 | July 6 |
| 1995 | 14 | 23 | 0.141 | July 14 | 0.135 | June 19 | 0.126 | Aug 21 | 0.117 | July 15 |
| 1996 | 8 | 15 | 0.107 | July 18 | 0.103 | July 6 | 0.098 | July 16 | 0.095 | June 14 |
| 1997 | 19 | 25 | 0.151 | July 15 | 0.119 | July 14 | 0.113 | June 25 | 0.109 | Aug 2 |
| 1998 | 9 | 15 | 0.107 | June 26 | 0.105 | June 25 | 0.097 | Sept 6 | 0.097 | Sept 27 |
| 1999 | 16 | 22 | 0.130 | June 7 | 0.114 | July 6 | 0.105 | July 16 | 0.104 | July 17 |
| 2000 | 6 | 16 | 0.121 | June 10 | 0.104 | June 11 | 0.093 | June 9 | 0.087 | Aug 27 |
| 2001 | 11 | 21 | 0.133 | Aug 7 | 0.126 | Aug 9 | 0.105 | June 30 | 0.100 | July 25 |
| 2002 | 20 | 31 | 0.134 | July 2 | 0.126 | July 18 | 0.114 | Aug 13 | 0.110 | July 9 |
| 2003 | 9 | 16 | 0.124 | June 25 | 0.117 | June 27 | 0.115 | June 26 | 0.101 | July 5 |
| 2004 | 2 | 5 | 0.111 | June 9 | 0.086 | June 8 | 0.084 | July 20 | 0.077 | June 15 |
| 2005 | 8 | 16 | 0.099 | Aug 13 | 0.096 | Sept 12 | 0.093 | July 19 | 0.092 | July 21 |
| 2006 | 6 | 8 | 0.114 | July 18 | 0.100 | Aug 2 | 0.095 | June 18 | 0.095 | Aug 3 |
| 2007 | 6 | 13 | 0.105 | May 25 | 0.101 | Aug 4 | 0.095 | June 26 | 0.093 | July 8 |
| 2008 | 3 | 7 | 0.105 | July 19 | 0.092 | July 18 | 0.085 | June 10 | 0.078 | July 17 |
| 2009 | 0 | 1 | 0.079 | Aug 17 | 0.075 | Aug 26 | 0.074 | Aug 5 | 0.073 | Aug 18 |
| 2010 | 0 | 7 | 0.082 | July 4 | 0.081 | July 17 | 0.080 | July 6 | 0.079 | July 5 |
| 2011 | 5 | 8 | 0.103 | July 22 | 0.097 | June 7 | 0.097 | June 8 | 0.092 | July 18 |
Middletown
Operating from 1982 to Present |
||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Year | # Days > | 1st High (ppm) | Date | 2nd High (ppm) | Date | 3rd High (ppm) | Date | 4th High (ppm) | Date | |
| 0.084 | 0.075 | |||||||||
| 1994 | 14 | 22 | 0.135 | June 18 | 0.109 | Aug 9 | 0.104 | July 13 | 0.102 | July 6 |
| 1995 | 11 | 23 | 0.123 | July 14 | 0.123 | Aug 1 | 0.110 | July 13 | 0.102 | Aug 2 |
| 1996 | 5 | 9 | 0.096 | Aug 23 | 0.092 | Aug 6 | 0.090 | July 18 | 0.089 | July 6 |
| 1997 | 12 | 18 | 0.145 | June 25 | 0.113 | June 21 | 0.108 | June 30 | 0.103 | June 12 |
| 1998 | 5 | 20 | 0.114 | Aug 24 | 0.098 | Sept 6 | 0.089 | July 15 | 0.089 | Sept 27 |
| 1999 | 15 | 20 | 0.128 | July 16 | 0.122 | July 24 | 0.113 | July 17 | 0.107 | July 15 |
| 2000 | 6 | 14 | 0.103 | June 10 | 0.092 | May 9 | 0.090 | May 7 | 0.089 | June 2 |
| 2001 | 11 | 22 | 0.111 | June 30 | 0.111 | Aug 9 | 0.108 | Aug 2 | 0.102 | June 19 |
| 2002 | 17 | 27 | 0.126 | July 9 | 0.110 | June 11 | 0.110 | June 23 | 0.110 | Aug 13 |
| 2003 | 7 | 12 | 0.111 | July 4 | 0.096 | June 24 | 0.093 | June 27 | 0.092 | June 25 |
| 2004 | 1 | 7 | 0.102 | June 8 | 0.084 | July 22 | 0.083 | Aug 28 | 0.082 | Aug 20 |
| 2005 | 7 | 16 | 0.110 | June 25 | 0.106 | June 26 | 0.099 | Aug 13 | 0.096 | July 26 |
| 2006 | 5 | 11 | 0.110 | June 18 | 0.098 | July 17 | 0.094 | June 22 | 0.089 | June 19 |
| 2007 | 7 | 15 | 0.111 | June 26 | 0.101 | June 27 | 0.099 | Aug 3 | 0.093 | July 9 |
| 2008 | 1 | 8 | 0.091 | June 7 | 0.083 | June 10 | 0.083 | July 26 | 0.082 | July 8 |
| 2009 | 0 | 1 | 0.081 | April 28 | 0.075 | Aug 18 | 0.071 | Aug 4 | 0.070 | April 27 |
| 2010 | 1 | 6 | 0.086 | Sep 2 | 0.083 | June 27 | 0.081 | July 16 | 0.081 | Aug 9 |
| 2011 | 3 | 6 | 0.090 | July 11 | 0.088 | July 6 | 0.087 | June 8 | 0.080 | June 7 |
New Haven
Operating from 1982 to 1999, Restarted 2004 |
||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Year | # Days > | 1st High (ppm) | Date | 2nd High (ppm) | Date | 3rd High (ppm) | Date | 4th High (ppm) | Date | |
| 0.084 | 0.075 | |||||||||
| 1994 | 3 | 6 | 0.116 | June 18 | 0.100 | July 2 | 0.087 | July 13 | 0.083 | July 6 |
| 1995 | 4 | 7 | 0.107 | June 14 | 0.098 | Aug 1 | 0.095 | Aug 2 | 0.092 | June 18 |
| 1996 | 2 | 3 | 0.088 | July 6 | 0.099 | Aug 6 | 0.076 | Aug 23 | 0.072 | Aug 4 |
| 1997 | 7 | 12 | 0.102 | July 15 | 0.099 | June 25 | 0.092 | June 21 | 0.089 | Aug 2 |
| 1998 | 3 | 6 | 0.088 | Aug 24 | 0.088 | Sept 6 | 0.085 | July 4 | 0.079 | July 3 |
| 1999 | 5 | 12 | 0.105 | July 17 | 0.099 | July 16 | 0.095 | June 1 | 0.094 | July 29 |
| 2004 | 1 | 3 | 0.085 | July 22 | 0.078 | June 9 | 0.077 | July 17 | 0.073 | July 8 |
| 2005 | 2 | 7 | 0.108 | Aug 13 | 0.085 | Aug 12 | 0.084 | June 25 | 0.080 | June 26 |
| 2006 | 1 | 6 | 0.100 | June 18 | 0.083 | July 4 | 0.080 | July 2 | 0.079 | Aug 1 |
| 2007 | 3 | 6 | 0.087 | May 25 | 0.087 | July 17 | 0.085 | June 2 | 0.082 | July 9 |
| 2008 | 0 | 2 | 0.084 | June 28 | 0.080 | July 26 | 0.074 | June 14 | 0.074 | Aug 18 |
| 2009 | 0 | 0 | 0.071 | Aug 15 | 0.065 | July 17 | 0.063 | Aug 16 | 0.062 | April 28 |
| 2010 | 0 | 1 | 0.076 | June 27 | 0.073 | May 1 | 0.070 | July 17 | 0.068 | June 4 |
| 2011 | 2 | 6 | 0.098 | July 11 | 0.085 | June 8 | 0.083 | June 7 | 0.080 | July 22 |
Stafford
Operating from 1982 to Present |
||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Year | # Days > | 1st High (ppm) | Date | 2nd High (ppm) | Date | 3rd High (ppm) | Date | 4th High (ppm) | Date | |
| 0.084 | 0.075 | |||||||||
| 1994 | 13 | 19 | 0.109 | Aug 9 | 0.101 | July 2 | 0.100 | Aug 4 | 0.097 | July 20 |
| 1995 | 6 | 12 | 0.114 | July 13 | 0.108 | June 30 | 0.101 | Sept 7 | 0.094 | Aug 31 |
| 1996 | 1 | 9 | 0.100 | Aug 7 | 0.084 | July 8 | 0.083 | June 8 | 0.083 | July 9 |
| 1997 | 10 | 12 | 0.142 | June 25 | 0.128 | June 21 | 0.099 | Aug 10 | 0.097 | June 30 |
| 1998 | 8 | 19 | 0.118 | Aug 24 | 0.114 | July 15 | 0.101 | July 16 | 0.098 | May 29 |
| 1999 | 12 | 20 | 0.101 | Aug 17 | 0.098 | June 1 | 0.095 | June 24 | 0.091 | May 31 |
| 2000 | 1 | 6 | 0.098 | June 10 | 0.084 | July 3 | 0.081 | June 26 | 0.079 | June 16 |
| 2001 | 10 | 18 | 0.122 | June 20 | 0.118 | June 19 | 0.108 | July 23 | 0.102 | July 24 |
| 2002 | 14 | 25 | 0.116 | Aug 13 | 0.112 | June 11 | 0.111 | Aug 14 | 0.102 | Aug 11 |
| 2003 | 1 | 6 | 0.085 | June 25 | 0.082 | June 27 | 0.082 | July 4 | 0.081 | July 2 |
| 2004 | 2 | 6 | 0.089 | May 15 | 0.085 | Aug 20 | 0.083 | July 22 | 0.081 | Aug 3 |
| 2005 | 8 | 12 | 0.106 | June 26 | 0.101 | July 27 | 0.099 | June 9 | 0.097 | June 25 |
| 2006 | 4 | 8 | 0.105 | June 18 | 0.100 | June 22 | 0.096 | June 19 | 0.089 | Aug 7 |
| 2007 | 7 | 18 | 0.107 | Aug 3 | 0.101 | June 27 | 0.100 | July 9 | 0.087 | June 25 |
| 2008 | 3 | 7 | 0.094 | June 10 | 0.087 | June 7 | 0.087 | July 3 | 0.084 | July 8 |
| 2009 | 0 | 3 | 0.082 | April 28 | 0.081 | May 22 | 0.079 | Aug 18 | 0.074 | Aug 4 |
| 2010 | 2 | 6 | 0.101 | Sep 2 | 0.087 | July 28 | 0.082 | Aug 9 | 0.079 | July 16 |
| 2011 | 1 | 1 | 0.087 | July 11 | 0.072 | June 21 | 0.072 | June 6 | 0.068 | June 8 |
Stratford
Operating from 1982 to Present |
||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Year | # Days > | 1st High (ppm) | Date | 2nd High (ppm) | Date | 3rd High (ppm) | Date | 4th High (ppm) | Date | |
| 0.084 | 0.075 | |||||||||
| 1994 | 9 | 21 | 0.129 | June 18 | 0.126 | July 13 | 0.101 | July 2 | 0.093 | July 25 |
| 1995 | 10 | 18 | 0.130 | July 14 | 0.117 | Aug 1 | 0.117 | June 19 | 0.115 | Aug 21 |
| 1996 | 9 | 12 | 0.107 | Aug 5 | 0.097 | Aug 6 | 0.096 | July 6 | 0.096 | July 18 |
| 1997 | 17 | 26 | 0.143 | July 15 | 0.123 | July 14 | 0.106 | July 17 | 0.103 | Aug 2 |
| 1998 | 11 | 25 | 0.109 | June 25 | 0.106 | Aug 24 | 0.100 | June 26 | 0.097 | Aug 29 |
| 1999 | 9 | 17 | 0.133 | June 7 | 0.104 | July 16 | 0.100 | July 17 | 0.096 | July 15 |
| 2000 | 4 | 11 | 0.124 | June 10 | 0.094 | June 11 | 0.091 | May 7 | 0.090 | June 2 |
| 2001 | 10 | 18 | 0.131 | Aug 7 | 0.120 | Aug 9 | 0.110 | July 25 | 0.102 | June 30 |
| 2002 | 20 | 29 | 0.129 | July 2 | 0.115 | July 18 | 0.104 | Aug 13 | 0.103 | Aug 12 |
| 2003 | 8 | 15 | 0.125 | June 25 | 0.114 | June 26 | 0.106 | July 4 | 0.101 | June 27 |
| 2004 | 2 | 7 | 0.110 | June 9 | 0.088 | July 21 | 0.081 | May 11 | 0.081 | June 8 |
| 2005 | 8 | 13 | 0.096 | Aug 11 | 0.096 | Aug 13 | 0.092 | July 21 | 0.090 | Sept 12 |
| 2006 | 7 | 14 | 0.110 | July 17 | 0.099 | July 18 | 0.097 | June 18 | 0.095 | Aug 2 |
| 2007 | 7 | 15 | 0.095 | June 26 | 0.094 | July 17 | 0.093 | Aug 2 | 0.092 | May 25 |
| 2008 | 2 | 6 | 0.103 | July 19 | 0.094 | July 18 | 0.083 | July 16 | 0.078 | July 26 |
| 2009 | 0 | 2 | 0.084 | Aug 15 | 0.081 | Aug 17 | 0.073 | April 28 | 0.073 | Aug 16 |
| 2010 | 0 | 9 | 0.080 | July 5 | 0.080 | July 17 | 0.080 | Sep 1 | 0.079 | July 4 |
| 2011 | 5 | 8 | 0.095 | June 8 | 0.092 | June 7 | 0.088 | July 11 | 0.087 | July 7 |
Torrington
Operating from 1991 to 2000 |
||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Year | # Days > | 1st High (ppm) | Date | 2nd High (ppm) | Date | 3rd High (ppm) | Date | 4th High (ppm) | Date | |
| 0.084 | 0.075 | |||||||||
| 1994 | 5 | 11 | 0.100 | Aug 4 | 0.098 | July 20 | 0.096 | Aug 9 | 0.095 | July 2 |
| 1995 | 7 | 13 | 0.107 | July 13 | 0.102 | Aug 31 | 0.099 | Sept 7 | 0.095 | July 4 |
| 1996 | 4 | 10 | 0.096 | Aug 7 | 0.096 | Aug 8 | 0.092 | July 8 | 0.092 | June 8 |
| 1997 | 9 | 13 | 0.099 | Aug 11 | 0.098 | Aug 10 | 0.097 | July 27 | 0.097 | June 21 |
| 1998 | 10 | 19 | 0.098 | May 29 | 0.098 | July 14 | 0.098 | July 15 | 0.097 | Aug 24 |
| 1999 | 12 | 24 | 0.103 | July 31 | 0.102 | July 16 | 0.100 | Aug 17 | 0.098 | July 29 |
| 2000 | 4 | 9 | 0.097 | June 10 | 0.087 | June 2 | 0.086 | June 26 | 0.085 | June 24 |
Westport
Operating from 1996 to Present |
||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Year | # Days > | 1st High (ppm) | Date | 2nd High (ppm) | Date | 3rd High (ppm) | Date | 4th High (ppm) | Date | |
| 0.084 | 0.075 | |||||||||
| 1996 | 8 | 14 | 0.111 | July 18 | 0.108 | Aug 5 | 0.099 | July 6 | 0.097 | July 17 |
| 1997 | 15 | 23 | 0.141 | July 15 | 0.118 | July 14 | 0.111 | June 21 | 0.109 | July 17 |
| 1998 | 13 | 19 | 0.106 | June 25 | 0.106 | Aug 24 | 0.093 | Aug 30 | 0.089 | July 13 |
| 1999 | 13 | 22 | 0.121 | July 16 | 0.117 | June 7 | 0.113 | July 17 | 0.111 | July 18 |
| 2000 | 3 | 11 | 0.120 | June 10 | 0.089 | May 6 | 0.085 | June 2 | 0.084 | May 7 |
| 2001 | 15 | 19 | 0.133 | Aug 7 | 0.122 | Aug 9 | 0.114 | July 25 | 0.097 | May 4 |
| 2002 | 21 | 30 | 0.117 | July 18 | 0.114 | Aug 12 | 0.111 | July 2 | 0.109 | July 9 |
| 2003 | 6 | 13 | 0.113 | June 26 | 0.112 | June 25 | 0.108 | July 4 | 0.097 | Aug 21 |
| 2004 | 2 | 8 | 0.099 | June 9 | 0.087 | July 22 | 0.082 | June 8 | 0.081 | July 2 |
| 2005 | 9 | 16 | 0.100 | Aug 13 | 0.092 | July 26 | 0.091 | July 21 | 0.088 | Aug 11 |
| 2006 | 6 | 14 | 0.119 | June 18 | 0.109 | July 17 | 0.102 | July 18 | 0.089 | June 22 |
| 2007 | 3 | 8 | 0.096 | June 26 | 0.093 | May 25 | 0.085 | June 1 | 0.083 | June 27 |
| 2008 | 5 | 10 | 0.103 | July 19 | 0.095 | July 18 | 0.093 | June 7 | 0.090 | June 10 |
| 2009 | 1 | 2 | 0.085 | Aug 17 | 0.082 | Aug 15 | 0.073 | April 28 | 0.073 | Aug 16 |
| 2010 | 1 | 10 | 0.087 | Sep 1 | 0.083 | July 12 | 0.079 | July 5 | 0.079 | July 21 |
| 2011 | 5 | 9 | 0.101 | June 8 | 0.092 | June 7 | 0.087 | June 9 | 0.087 | July 7 |
