NEW HAMPSHIRE
For 1999 through 2022, click on the date for the corresponding eight-hour average peak ozone map for that day. In October 2015, 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 (0.08 ppm). Maps for 2008 through 2015 are based on the 2008 ozone standard (0.075 ppm). Maps for 2016 through 2023 are based on the 2015 ozone standard (0.070 ppm). Click Here for a table showing the revised AQI breakpoints for the 1997, 2008, and 2015 ozone standards.
Brentwood | Claremont | Concord | Conway | Haverhill | Keene | Laconia | Lebanon | Londonderry | Manchester | Miller State Park | Mt Washington - Camp Dodge | Mt Washington - Summit | Nashua | Portsmouth | Rochester | Rye
Brentwood
Operating from 1998 to 2002 |
||||||||||
---|---|---|---|---|---|---|---|---|---|---|
Year | # Days > | 1st High (ppm) | Date | 2nd High (ppm) | Date | 3rd High (ppm) | Date | 4th High (ppm) | Date | |
0.075 | 0.070 | |||||||||
1998 | 0 | 2 | 0.074 | April 9 | 0.071 | Aug 5 | 0.067 | July 14 | 0.066 | July 15 |
1999 | 7 | 8 | 0.085 | July 30 | 0.082 | Aug 25 | 0.080 | July 31 | 0.079 | Aug 17 |
2000 | 0 | 0 | 0.066 | June 16 | 0.064 | July 3 | 0.063 | June 21 | 0.061 | July 14 |
2001 | 11 | 15 | 0.103 | June 19 | 0.091 | June 14 | 0.089 | June 20 | 0.088 | July 23 |
2002 | 15 | 17 | 0.104 | Aug 12 | 0.098 | Aug 13 | 0.093 | Aug 14 | 0.091 | July 22 |
Claremont
Operating from 1990 to 2008 |
||||||||||
---|---|---|---|---|---|---|---|---|---|---|
Year | # Days > | 1st High (ppm) | Date | 2nd High (ppm) | Date | 3rd High (ppm) | Date | 4th High (ppm) | Date | |
0.075 | 0.070 | |||||||||
1994 | 1 | 3 | 0.086 | Aug 4 | 0.071 | June 5 | 0.071 | July 5 | 0.070 | Aug 20 |
1995 | 2 | 5 | 0.078 | June 16 | 0.076 | July 6 | 0.074 | July 5 | 0.074 | July 13 |
1996 | 3 | 3 | 0.086 | June 2 | 0.083 | July 12 | 0.079 | Aug 8 | 0.065 | July 8 |
1997 | 2 | 5 | 0.088 | July 1 | 0.076 | June 30 | 0.075 | Aug 10 | 0.075 | Aug 11 |
1998 | 0 | 2 | 0.075 | May 29 | 0.072 | July 15 | 0.070 | July 27 | 0.067 | May 28 |
1999 | 5 | 7 | 0.084 | July 31 | 0.080 | July 17 | 0.078 | July 16 | 0.077 | May 31 |
2000 | 1 | 2 | 0.089 | June 10 | 0.071 | June 21 | 0.069 | June 25 | 0.067 | July 14 |
2001 | 2 | 5 | 0.083 | June 19 | 0.077 | Aug 16 | 0.074 | May 3 | 0.072 | May 4 |
2002 | 5 | 7 | 0.094 | Aug 14 | 0.086 | Aug 15 | 0.084 | Sept 14 | 0.082 | Aug 12 |
2003 | 2 | 5 | 0.084 | June 29 | 0.078 | April 15 | 0.075 | July 3 | 0.073 | July 4 |
2004 | 4 | 6 | 0.095 | July 22 | 0.084 | Aug 10 | 0.081 | June 24 | 0.076 | April 30 |
2005 | 2 | 2 | 0.080 | June 25 | 0.076 | April 20 | 0.068 | April 17 | 0.067 | Aug 27 |
2006 | 0 | 1 | 0.071 | March 31 | 0.070 | July 10 | 0.065 | June 18 | 0.065 | June 19 |
2007 | 5 | 6 | 0.080 | June 8 | 0.079 | April 23 | 0.078 | May 25 | 0.076 | July 27 |
2008 | 1 | 1 | 0.079 | April 19 | 0.070 | April 22 | 0.069 | April 18 | 0.066 | April 21 |
Concord
Operating from 1992 to Present, Relocated 2004 |
||||||||||
---|---|---|---|---|---|---|---|---|---|---|
Year | # Days > | 1st High (ppm) | Date | 2nd High (ppm) | Date | 3rd High (ppm) | Date | 4th High (ppm) | Date | |
0.075 | 0.070 | |||||||||
1994 | 2 | 4 | 0.090 | Aug 4 | 0.081 | May 30 | 0.073 | July 21 | 0.071 | July 20 |
1995 | 0 | 2 | 0.072 | June 18 | 0.072 | Sept 7 | 0.070 | June 30 | 0.067 | Aug 1 |
1996 | 3 | 4 | 0.088 | June 2 | 0.086 | Aug 8 | 0.076 | July 12 | 0.072 | June 7 |
1997 | 3 | 5 | 0.098 | July 1 | 0.081 | June 21 | 0.076 | Aug 11 | 0.075 | Aug 10 |
1998 | 2 | 5 | 0.084 | July 14 | 0.077 | July 28 | 0.074 | May 29 | 0.074 | July 15 |
1999 | 3 | 4 | 0.080 | July 30 | 0.078 | July 17 | 0.077 | June 1 | 0.074 | July 16 |
2000 | 1 | 2 | 0.076 | June 16 | 0.075 | June 17 | 0.065 | June 25 | 0.065 | July 2 |
2001 | 2 | 6 | 0.102 | June 19 | 0.076 | Aug 16 | 0.073 | June 20 | 0.072 | July 23 |
2002 | 8 | 13 | 0.091 | July 22 | 0.089 | Aug 14 | 0.086 | Aug 12 | 0.085 | Aug 15 |
2003 | 2 | 2 | 0.076 | April 15 | 0.076 | June 29 | 0.070 | July 3 | 0.068 | June 25 |
2004 | 2 | 7 | 0.092 | July 22 | 0.083 | Aug 10 | 0.075 | April 30 | 0.072 | July 30 |
2005 | 3 | 6 | 0.078 | April 20 | 0.078 | June 25 | 0.077 | Sept 14 | 0.075 | June 27 |
2006 | 0 | 3 | 0.074 | July 27 | 0.073 | June 19 | 0.071 | May 26 | 0.069 | May 31 |
2007 | 3 | 6 | 0.087 | May 25 | 0.079 | April 23 | 0.079 | Sept 7 | 0.072 | May 9 |
2008 | 0 | 0 | 0.068 | April 19 | 0.067 | April 22 | 0.067 | April 23 | 0.067 | May 26 |
2009 | 0 | 1 | 0.072 | May 22 | 0.069 | May 21 | 0.065 | May 20 | 0.064 | April 25 |
2010 | 0 | 2 | 0.078 | July 28 | 0.073 | May 2 | 0.070 | April 3 | 0.068 | Sep 3 |
2011 | 0 | 0 | 0.068 | July 11 | 0.068 | July 20 | 0.066 | July 21 | 0.064 | May 27 |
2012 | 0 | 1 | 0.071 | April 20 | 0.071 | April 16 | 0.067 | July 13 | 0.064 | May 13 |
2013 | 0 | 0 | 0.069 | April 30 | 0.067 | April 29 | 0.066 | April 28 | 0.065 | June 1 |
2014 | 0 | 1 | 0.071 | June 3 | 0.063 | May 12 | 0.062 | July 1 | 0.061 | April 22 |
2015 | 0 | 1 | 0.072 | May 4 | 0.062 | April 13 | 0.062 | May 24 | 0.062 | Aug 3 |
2016 | 0 | 0 | 0.065 | May 25 | 0.064 | July 25 | 0.062 | April 22 | 0.062 | July 13 |
2017 | 0 | 0 | 0.067 | April 10 | 0.067 | April 11 | 0.065 | April 15 | 0.065 | May 17 |
2018 | 0 | 0 | 0.066 | May 2 | 0.066 | May 25 | 0.063 | April 24 | 0.060 | July 2 |
2019 | 0 | 0 | 0.058 | July 11 | 0.057 | June 10 | 0.056 | Aug 6 | 0.055 | June 15 |
2020 | 0 | 0 | 0.062 | Aug 11 | 0.061 | June 23 | 0.057 | June 17 | 0.054 | May 15 |
2021 | 0 | 1 | 0.071 | June 6 | 0.065 | May 21 | 0.061 | June 5 | 0.060 | May 26 |
2022 | 0 | 0 | 0.065 | July 1 | 0.063 | Aug 20 | 0.060 | May 9 | 0.057 | July 24 |
2023 | 0 | 0 | 0.070 | April 14 | 0.068 | July 13 | 0.064 | June 12 | 0.062 | April 13 |
Conway
Operating from 1996 to 2002 |
||||||||||
---|---|---|---|---|---|---|---|---|---|---|
Year | # Days > | 1st High (ppm) | Date | 2nd High (ppm) | Date | 3rd High (ppm) | Date | 4th High (ppm) | Date | |
0.075 | 0.070 | |||||||||
1996* | 1 | 2 | 0.081 | June 2 | 0.072 | Aug 8 | 0.068 | July 8 | 0.060 | Aug 9 |
1997 | 1 | 1 | 0.084 | July 1 | 0.067 | Aug 11 | 0.066 | April 16 | 0.065 | June 21 |
1998 | 0 | 2 | 0.073 | May 1 | 0.072 | April 15 | 0.070 | July 15 | 0.068 | May 29 |
1999 | 1 | 2 | 0.079 | June 1 | 0.074 | July 17 | 0.070 | July 30 | 0.068 | Sept 4 |
2000 | 0 | 1 | 0.073 | June 25 | 0.060 | June 1 | 0.060 | June 16 | 0.058 | July 14 |
2001 | 1 | 5 | 0.077 | May 2 | 0.075 | May 3 | 0.074 | June 19 | 0.074 | July 24 |
2002 | 2 | 3 | 0.091 | Aug 15 | 0.076 | Aug 12 | 0.071 | Aug 14 | 0.070 | June 26 |
*Site did not meet 75% minimum data completeness requirement. |
Haverhill
Operating from 1996 to 2004 |
||||||||||
---|---|---|---|---|---|---|---|---|---|---|
Year | # Days > | 1st High (ppm) | Date | 2nd High (ppm) | Date | 3rd High (ppm) | Date | 4th High (ppm) | Date | |
0.075 | 0.070 | |||||||||
1996* | 0 | 0 | 0.066 | Aug 8 | 0.062 | July 8 | 0.054 | Aug 9 | 0.050 | July 9 |
1997 | 0 | 1 | 0.075 | July 1 | 0.066 | April 30 | 0.065 | May 1 | 0.064 | June 21 |
1998 | 4 | 7 | 0.081 | April 15 | 0.077 | July 15 | 0.076 | May 28 | 0.076 | July 14 |
1999 | 2 | 5 | 0.078 | June 1 | 0.078 | July 17 | 0.073 | July 15 | 0.072 | May 31 |
2000 | 1 | 1 | 0.077 | July 14 | 0.070 | June 21 | 0.067 | June 22 | 0.062 | July 2 |
2001 | 1 | 8 | 0.082 | Aug 16 | 0.074 | July 24 | 0.073 | Sept 9 | 0.072 | May 3 |
2002 | 2 | 4 | 0.096 | Aug 14 | 0.083 | Aug 15 | 0.072 | June 26 | 0.071 | June 21 |
2003 | 3 | 5 | 0.082 | June 29 | 0.078 | April 15 | 0.077 | April 28 | 0.072 | July 3 |
2004 | 1 | 3 | 0.084 | July 22 | 0.074 | April 30 | 0.074 | July 23 | 0.074 | Aug 10 |
*Site did not meet 75% minimum data completeness requirement. |
Keene
Operating from 1990 to Present |
||||||||||
---|---|---|---|---|---|---|---|---|---|---|
Year | # Days > | 1st High (ppm) | Date | 2nd High (ppm) | Date | 3rd High (ppm) | Date | 4th High (ppm) | Date | |
0.075 | 0.070 | |||||||||
1994 | 5 | 11 | 0.083 | July 20 | 0.079 | May 31 | 0.077 | June 5 | 0.076 | July 21 |
1995 | 0 | 4 | 0.074 | June 18 | 0.074 | Aug 1 | 0.073 | June 30 | 0.071 | June 6 |
1996 | 4 | 5 | 0.090 | July 12 | 0.084 | June 2 | 0.083 | June 7 | 0.076 | July 8 |
1997 | 3 | 5 | 0.099 | July 1 | 0.079 | Aug 11 | 0.078 | June 30 | 0.075 | June 21 |
1998 | 1 | 5 | 0.085 | July 14 | 0.075 | May 29 | 0.075 | July 15 | 0.073 | July 27 |
1999 | 6 | 9 | 0.089 | July 31 | 0.080 | June 2 | 0.080 | July 17 | 0.079 | May 31 |
2000 | 1 | 1 | 0.092 | June 10 | 0.070 | June 25 | 0.069 | June 16 | 0.063 | July 14 |
2001 | 3 | 5 | 0.097 | June 19 | 0.079 | Sept 8 | 0.077 | July 23 | 0.074 | June 20 |
2002 | 8 | 10 | 0.098 | Aug 14 | 0.084 | Aug 12 | 0.084 | Aug 13 | 0.084 | Sept 14 |
2003 | 2 | 4 | 0.081 | June 29 | 0.077 | April 15 | 0.072 | July 3 | 0.071 | Aug 29 |
2004 | 2 | 3 | 0.081 | July 22 | 0.079 | Aug 10 | 0.074 | June 24 | 0.069 | July 30 |
2005 | 2 | 4 | 0.083 | June 9 | 0.077 | June 25 | 0.075 | Sept 14 | 0.074 | April 20 |
2006 | 0 | 2 | 0.075 | June 19 | 0.071 | July 27 | 0.068 | July 10 | 0.067 | July 25 |
2007 | 2 | 5 | 0.083 | June 8 | 0.076 | May 25 | 0.073 | April 23 | 0.072 | July 27 |
2008 | 1 | 2 | 0.080 | April 19 | 0.071 | June 10 | 0.069 | July 12 | 0.068 | April 22 |
2009 | 0 | 1 | 0.071 | May 22 | 0.069 | April 27 | 0.066 | May 21 | 0.062 | April 25 |
2010 | 0 | 0 | 0.066 | June 19 | 0.065 | Sep 3 | 0.064 | May 2 | 0.064 | July 12 |
2011 | 0 | 0 | 0.066 | July 20 | 0.064 | July 17 | 0.062 | July 11 | 0.062 | July 21 |
2012 | 0 | 1 | 0.074 | July 13 | 0.065 | April 16 | 0.063 | April 20 | 0.063 | Aug 4 |
2013 | 0 | 0 | 0.067 | April 28 | 0.064 | April 30 | 0.063 | June 22 | 0.063 | June 29 |
2014 | 0 | 1 | 0.075 | June 3 | 0.064 | May 12 | 0.060 | July 1 | 0.060 | July 8 |
2015 | 0 | 0 | 0.068 | May 4 | 0.060 | April 13 | 0.060 | May 25 | 0.059 | Jan 17 |
2016 | 0 | 1 | 0.072 | May 27 | 0.069 | May 25 | 0.066 | May 26 | 0.066 | June 20 |
2017 | 0 | 0 | 0.068 | June 12 | 0.066 | April 11 | 0.066 | May 17 | 0.064 | April 10 |
2018 | 0 | 0 | 0.065 | May 25 | 0.064 | May 2 | 0.062 | April 24 | 0.061 | May 26 |
2019 | 0 | 0 | 0.058 | June 5 | 0.055 | March 30 | 0.054 | March 24 | 0.053 | March 14 |
2020 | 0 | 0 | 0.055 | Aug 11 | 0.052 | May 21 | 0.052 | June 23 | 0.050 | April 19 |
2021 | 0 | 0 | 0.067 | June 6 | 0.064 | May 21 | 0.060 | June 5 | 0.059 | April 24 |
2022 | 0 | 0 | 0.064 | June 26 | 0.061 | July 1 | 0.059 | May 9 | 0.059 | Aug 20 |
2023 | 1 | 1 | 0.076 | July 1 | 0.067 | April 14 | 0.063 | April 13 | 0.060 | July 13 |
Laconia
Operating from 1996 to 1999, 2001 to Present,Relocated in 2001 |
||||||||||
---|---|---|---|---|---|---|---|---|---|---|
Year | # Days > | 1st High (ppm) | Date | 2nd High (ppm) | Date | 3rd High (ppm) | Date | 4th High (ppm) | Date | |
0.075 | 0.070 | |||||||||
1996 | 2 | 2 | 0.078 | June 2 | 0.076 | Aug 8 | 0.068 | Aug 7 | 0.062 | July 8 |
1997 | 2 | 2 | 0.087 | July 1 | 0.077 | Aug 10 | 0.069 | June 21 | 0.067 | April 30 |
1998 | 0 | 0 | 0.070 | July 15 | 0.066 | May 29 | 0.064 | May 1 | 0.064 | July 27 |
1999 | 3 | 5 | 0.082 | July 30 | 0.080 | May 31 | 0.076 | July 31 | 0.075 | July 16 |
2001 | 6 | 11 | 0.101 | June 19 | 0.085 | June 20 | 0.084 | Aug 16 | 0.080 | July 24 |
2002 | 5 | 12 | 0.090 | Aug 14 | 0.090 | Aug 15 | 0.085 | Aug 12 | 0.080 | June 26 |
2003 | 4 | 6 | 0.084 | April 15 | 0.083 | June 29 | 0.078 | July 21 | 0.076 | July 3 |
2004 | 3 | 3 | 0.083 | July 22 | 0.076 | April 30 | 0.076 | Aug 10 | 0.070 | May 1 |
2005 | 3 | 5 | 0.079 | April 20 | 0.078 | Sept 14 | 0.076 | Aug 27 | 0.073 | June 25 |
2006 | 0 | 2 | 0.074 | May 26 | 0.071 | April 12 | 0.068 | July 27 | 0.067 | June 19 |
2007 | 3 | 5 | 0.088 | May 25 | 0.079 | April 23 | 0.076 | Sept 7 | 0.075 | May 9 |
2008 | 0 | 1 | 0.071 | April 19 | 0.070 | April 18 | 0.070 | April 22 | 0.070 | April 23 |
2009 | 0 | 0 | 0.069 | May 21 | 0.068 | May 22 | 0.063 | May 20 | 0.062 | April 25 |
2010 | 1 | 3 | 0.076 | May 2 | 0.075 | Sep 3 | 0.071 | April 3 | 0.064 | July 28 |
2011 | 0 | 0 | 0.068 | May 27 | 0.064 | April 10 | 0.062 | May 26 | 0.061 | June 1 |
2012 | 0 | 0 | 0.069 | Aug 9 | 0.066 | April 16 | 0.066 | July 13 | 0.065 | April 20 |
2013 | 0 | 0 | 0.065 | April 30 | 0.064 | April 28 | 0.064 | April 29 | 0.060 | May 7 |
2014 | 0 | 0 | 0.067 | June 3 | 0.063 | April 22 | 0.061 | May 12 | 0.061 | July 1 |
2015 | 0 | 0 | 0.067 | May 4 | 0.061 | April 13 | 0.057 | May 24 | 0.055 | Aug 3 |
2016 | 0 | 0 | 0.065 | May 25 | 0.063 | April 22 | 0.060 | May 12 | 0.060 | June 20 |
2017 | 0 | 0 | 0.065 | April 10 | 0.065 | April 11 | 0.064 | May 17 | 0.065 | April 15 |
2018 | 0 | 0 | 0.064 | May 2 | 0.063 | May 25 | 0.062 | April 24 | 0.056 | May 9 |
2019 | 0 | 0 | 0.055 | Aug 6 | 0.054 | March 24 | 0.053 | March 28 | 0.053 | March 9 |
2020 | 0 | 0 | 0.058 | June 23 | 0.056 | Aug 11 | 0.054 | Sept 9 | 0.053 | May 15 |
2021 | 0 | 0 | 0.065 | June 6 | 0.062 | May 21 | 0.056 | Mar 11 | 0.056 | April 25 |
2022 | 0 | 0 | 0.058 | July 1 | 0.057 | May 9 | 0.057 | Aug 20 | 0.056 | May 11 |
2023 | 0 | 0 | 0.067 | April 14 | 0.064 | July 13 | 0.062 | April 13 | 0.060 | June 12 |
Lebanon
Operating from 2005 to Present |
||||||||||
---|---|---|---|---|---|---|---|---|---|---|
Year | # Days > | 1st High (ppm) | Date | 2nd High (ppm) | Date | 3rd High (ppm) | Date | 4th High (ppm) | Date | |
0.075 | 0.070 | |||||||||
2005 | 1 | 2 | 0.080 | June 25 | 0.072 | Sept 14 | 0.069 | Aug 27 | 0.068 | April 20 |
2006 | 0 | 1 | 0.074 | March 31 | 0.066 | June 18 | 0.064 | April 12 | 0.064 | Aug 7 |
2007 | 2 | 5 | 0.079 | May 25 | 0.077 | April 23 | 0.072 | June 8 | 0.072 | July 27 |
2008 | 1 | 1 | 0.077 | April 19 | 0.069 | April 18 | 0.068 | April 21 | 0.068 | April 22 |
2009 | 0 | 0 | 0.067 | May 21 | 0.061 | May 20 | 0.061 | May 22 | 0.059 | April 25 |
2010 | 0 | 0 | 0.065 | June 19 | 0.064 | April 3 | 0.062 | Sep 3 | 0.061 | April 22 |
2011 | 0 | 0 | 0.063 | July 17 | 0.060 | July 21 | 0.060 | June 1 | 0.059 | June 8 |
2012 | 0 | 0 | 0.069 | July 13 | 0.068 | April 20 | 0.068 | April 16 | 0.062 | May 20 |
2013 | 0 | 0 | 0.065 | April 29 | 0.062 | May 6 | 0.061 | April 28 | 0.061 | May 7 |
2014 | 0 | 1 | 0.071 | June 3 | 0.065 | May 12 | 0.063 | April 21 | 0.062 | May 10 |
2015 | 0 | 0 | 0.067 | May 4 | 0.061 | April 13 | 0.059 | May 24 | 0.053 | May 8 |
2016 | 0 | 0 | 0.063 | May 25 | 0.058 | May 27 | 0.057 | Aug 11 | 0.055 | April 18 |
2017 | 0 | 0 | 0.064 | May 17 | 0.062 | April 10 | 0.062 | April 15 | 0.062 | June 11 |
2018 | 0 | 0 | 0.067 | May 25 | 0.066 | April 24 | 0.066 | May 2 | 0.061 | July 2 |
2019 | 0 | 0 | 0.053 | March 24 | 0.050 | March 9 | 0.049 | March 20 | 0.049 | April 3 |
2020 | 0 | 0 | 0.056 | June 23 | 0.051 | May 22 | 0.050 | May 27 | 0.050 | April 19 |
2021 | 0 | 0 | 0.068 | June 6 | 0.060 | May 21 | 0.059 | June 6 | 0.057 | April 24 |
2022 | 0 | 0 | 0.065 | July 1 | 0.064 | June 26 | 0.058 | May 9 | 0.054 | July 11 |
2023 | 0 | 0 | 0.066 | July 13 | 0.065 | April 14 | 0.062 | April 13 | 0.058 | July 1 |
Londonderry
Operating from 2011 to Present |
||||||||||
---|---|---|---|---|---|---|---|---|---|---|
Year | # Days > | 1st High (ppm) | Date | 2nd High (ppm) | Date | 3rd High (ppm) | Date | 4th High (ppm) | Date | |
0.075 | 0.070 | |||||||||
2011 | 1 | 1 | 0.085 | July 21 | 0.070 | July 20 | 0.068 | May 27 | 0.068 | June 28 |
2012 | 2 | 3 | 0.082 | July 17 | 0.077 | July 13 | 0.073 | Aug 17 | 0.069 | April 20 |
2013 | 0 | 0 | 0.069 | April 30 | 0.068 | April 28 | 0.067 | June 1 | 0.067 | Sept 11 |
2014 | 0 | 1 | 0.074 | June 3 | 0.068 | April 22 | 0.068 | July 23 | 0.067 | May 12 |
2015 | 0 | 1 | 0.073 | May 4 | 0.064 | April 13 | 0.063 | Aug 18 | 0.062 | May 26 |
2016 | 0 | 1 | 0.075 | July 25 | 0.070 | May 25 | 0.069 | July 13 | 0.067 | April 22 |
2017 | 0 | 1 | 0.071 | April 11 | 0.070 | May 17 | 0.069 | April 10 | 0.068 | June 10 |
2018 | 0 | 1 | 0.072 | May 26 | 0.069 | May 25 | 0.067 | May 2 | 0.065 | April 24 |
2019 | 0 | 0 | 0.059 | June 10 | 0.057 | June 15 | 0.057 | March 24 | 0.056 | July 16 |
2020 | 0 | 0 | 0.064 | Aug 11 | 0.057 | June 4 | 0.056 | April 19 | 0.056 | June 17 |
2021 | 0 | 0 | 0.066 | June 18 | 0.065 | June 6 | 0.063 | March 11 | 0.063 | May 26 |
2022 | 0 | 0 | 0.069 | July 1 | 0.068 | Aug 20 | 0.060 | Aug 6 | 0.059 | June 26 |
2023 | 0 | 0 | 0.070 | April 14 | 0.066 | June 1 | 0.064 | April 13 | 0.063 | July 13 |
Manchester
Operating from 1984 to 2010, Relocated in 1999 and 2001 |
||||||||||
---|---|---|---|---|---|---|---|---|---|---|
Year | # Days > | 1st High (ppm) | Date | 2nd High (ppm) | Date | 3rd High (ppm) | Date | 4th High (ppm) | Date | |
0.075 | 0.070 | |||||||||
1994 | 5 | 8 | 0.082 | Aug 4 | 0.081 | July 21 | 0.079 | July 20 | 0.078 | Aug 9 |
1995 | 3 | 8 | 0.085 | June 24 | 0.085 | Sept 7 | 0.077 | June 30 | 0.074 | June 2 |
1996 | 7 | 8 | 0.092 | June 2 | 0.088 | Aug 7 | 0.087 | Aug 8 | 0.084 | July 12 |
1997 | 5 | 9 | 0.098 | July 1 | 0.087 | June 21 | 0.085 | Aug 11 | 0.082 | June 25 |
1998 | 0 | 1 | 0.074 | July 14 | 0.066 | April 30 | 0.065 | May 29 | 0.063 | Sept 20 |
1999* | 1 | 2 | 0.081 | Aug 17 | 0.074 | Sept 4 | 0.068 | Sept 9 | 0.067 | Aug 25 |
2000 | 2 | 2 | 0.079 | June 10 | 0.078 | June 16 | 0.070 | June 17 | 0.063 | June 21 |
2001* | 2 | 6 | 0.098 | June 19 | 0.081 | June 14 | 0.075 | Sept 8 | 0.074 | Aug 16 |
2002 | 10 | 13 | 0.091 | July 22 | 0.089 | Aug 14 | 0.088 | Aug 12 | 0.085 | Aug 13 |
2003 | 2 | 3 | 0.079 | June 26 | 0.079 | June 29 | 0.074 | June 27 | 0.070 | July 3 |
2004 | 1 | 4 | 0.094 | July 22 | 0.074 | July 23 | 0.073 | July 18 | 0.071 | July 30 |
2005 | 1 | 4 | 0.081 | June 27 | 0.073 | June 25 | 0.072 | Sept 14 | 0.071 | June 9 |
2006 | 1 | 2 | 0.076 | June 19 | 0.072 | Aug 14 | 0.069 | March 31 | 0.069 | July 27 |
2007 | 1 | 7 | 0.086 | May 25 | 0.075 | April 23 | 0.075 | Aug 3 | 0.074 | Sept 7 |
2008 | 0 | 0 | 0.064 | April 18 | 0.064 | April 19 | 0.064 | April 23 | 0.064 | June 14 |
2009 | 0 | 0 | 0.068 | May 21 | 0.067 | May 22 | 0.064 | Aug 18 | 0.060 | May 20 |
2010 | 0 | 1 | 0.077 | July 28 | 0.070 | Sep 2 | 0.066 | May 2 | 0.063 | Sep 3 |
*Site did not meet 75% minimum data completeness requirement. |
Miller State Park
Operating from 2002 to Present |
||||||||||
---|---|---|---|---|---|---|---|---|---|---|
Year | # Days > | 1st High (ppm) | Date | 2nd High (ppm) | Date | 3rd High (ppm) | Date | 4th High (ppm) | Date | |
0.075 | 0.070 | |||||||||
2002* | 9 | 15 | 0.111 | Aug 4 | 0.107 | Aug 13 | 0.106 | Aug 11 | 0.101 | Aug 12 |
2003 | 5 | 9 | 0.083 | June 29 | 0.079 | June 25 | 0.078 | April 15 | 0.076 | June 27 |
2004 | 4 | 6 | 0.087 | Aug 10 | 0.084 | July 22 | 0.078 | July 30 | 0.076 | June 24 |
2005 | 8 | 15 | 0.087 | Sept 13 | 0.086 | July 26 | 0.086 | Sept 14 | 0.081 | April 20 |
2006 | 5 | 11 | 0.086 | June 19 | 0.085 | June 22 | 0.083 | June 18 | 0.078 | July 27 |
2007 | 11 | 15 | 0.094 | June 8 | 0.088 | May 25 | 0.082 | Sept 7 | 0.081 | April 23 |
2008 | 5 | 8 | 0.087 | June 10 | 0.083 | June 14 | 0.082 | June 13 | 0.076 | April 19 |
2009 | 0 | 5 | 0.074 | May 22 | 0.072 | April 25 | 0.072 | April 27 | 0.072 | May 21 |
2010 | 4 | 7 | 0.082 | July 28 | 0.080 | Sep 2 | 0.077 | May 1 | 0.077 | Sep 7 |
2011 | 0 | 3 | 0.075 | July 11 | 0.073 | July 20 | 0.073 | July 21 | 0.062 | April 10 |
2012 | 2 | 6 | 0.078 | July 13 | 0.078 | Sept 13 | 0.074 | July 17 | 0.073 | May 13 |
2013 | 0 | 1 | 0.074 | May 31 | 0.067 | April 28 | 0.067 | June 1 | 0.067 | Sept 11 |
2014 | 1 | 1 | 0.079 | June 3 | 0.070 | May 26 | 0.070 | May 27 | 0.070 | June 2 |
2015 | 1 | 2 | 0.079 | Sept 18 | 0.073 | May 4 | 0.066 | May 7 | 0.066 | May 26 |
2016 | 0 | 3 | 0.073 | May 25 | 0.073 | May 26 | 0.072 | May 27 | 0.069 | May 28 |
2017 | 0 | 1 | 0.071 | April 11 | 0.069 | May 17 | 0.068 | April 10 | 0.066 | June 12 |
2018 | 0 | 0 | 0.069 | May 25 | 0.068 | May 26 | 0.066 | May 2 | 0.063 | April 24 |
2019 | 0 | 0 | 0.064 | June 5 | 0.057 | June 15 | 0.056 | July 10 | 0.058 | March 24 |
2020 | 0 | 0 | 0.063 | Aug 11 | 0.062 | June 4 | 0.058 | July 19 | 0.055 | May 21 |
2021 | 0 | 0 | 0.069 | May 21 | 0.065 | June 6 | 0.064 | June 5 | 0.062 | April 24 |
2022 | 0 | 0 | 0.070 | July 1 | 0.067 | Aug 6 | 0.064 | Aug 20 | 0.062 | May 9 |
2023 | 0 | 2 | 0.074 | April 14 | 0.072 | June 11 | 0.067 | April 13 | 0.067 | July 13 |
*Site did not meet 75% minimum data completeness requirement. |
Mt. Washington - Camp Dodge
Operating from 2023 |
||||||||||
---|---|---|---|---|---|---|---|---|---|---|
Year | # Days > | 1st High (ppm) | Date | 2nd High (ppm) | Date | 3rd High (ppm) | Date | 4th High (ppm) | Date | |
0.075 | 0.070 | |||||||||
2023 | 0 | 0 | 0.059 | April 13 | 0.059 | April 14 | 0.059 | July 13 | 0.053 | April 15 |
Mt. Washington - Summit
Operating from 2023 |
||||||||||
---|---|---|---|---|---|---|---|---|---|---|
Year | # Days > | 1st High (ppm) | Date | 2nd High (ppm) | Date | 3rd High (ppm) | Date | 4th High (ppm) | Date | |
0.075 | 0.070 | |||||||||
2023 | 1 | 3 | 0.081 | April 15 | 0.071 | April 14 | 0.071 | July 1 | 0.068 | April 21 |
Nashua
Operating from 1983 to Present, Relocated in 2004 |
||||||||||
---|---|---|---|---|---|---|---|---|---|---|
Year | # Days > | 1st High (ppm) | Date | 2nd High (ppm) | Date | 3rd High (ppm) | Date | 4th High (ppm) | Date | |
0.075 | 0.070 | |||||||||
1994 | 9 | 17 | 0.092 | Aug 4 | 0.087 | Aug 9 | 0.087 | July 21 | 0.083 | July 20 |
1995 | 13 | 19 | 0.100 | Sept 7 | 0.096 | July 13 | 0.093 | Aug 31 | 0.088 | Aug 1 |
1996 | 6 | 8 | 0.088 | Aug 7 | 0.087 | Aug 8 | 0.082 | July 12 | 0.081 | June 2 |
1997 | 9 | 13 | 0.107 | July 1 | 0.102 | June 25 | 0.096 | June 21 | 0.094 | Aug 11 |
1998 | 7 | 10 | 0.096 | Aug 24 | 0.089 | May 29 | 0.086 | July 15 | 0.084 | July 28 |
1999 | 11 | 19 | 0.090 | June 1 | 0.089 | May 31 | 0.089 | July 31 | 0.089 | Aug 17 |
2000 | 2 | 3 | 0.090 | June 10 | 0.078 | June 16 | 0.072 | July 3 | 0.070 | June 17 |
2001 | 13 | 19 | 0.110 | June 19 | 0.092 | June 20 | 0.091 | July 23 | 0.091 | July 24 |
2002 | 15 | 21 | 0.110 | Aug 13 | 0.109 | Aug 12 | 0.098 | Aug 14 | 0.094 | June 26 |
2003 | 5 | 10 | 0.085 | June 29 | 0.082 | June 26 | 0.079 | June 27 | 0.078 | July 30 |
2004 | 5 | 10 | 0.097 | July 22 | 0.087 | July 23 | 0.081 | Aug 10 | 0.080 | July 30 |
2005 | 8 | 14 | 0.096 | June 27 | 0.084 | Sept 14 | 0.083 | June 25 | 0.082 | July 26 |
2006 | 1 | 8 | 0.084 | June 19 | 0.078 | March 31 | 0.075 | Aug 14 | 0.073 | May 25 |
2007 | 8 | 10 | 0.090 | May 25 | 0.084 | April 23 | 0.081 | June 8 | 0.081 | Sept 7 |
2008 | 0 | 0 | 0.070 | April 19 | 0.069 | April 18 | 0.068 | June 14 | 0.067 | June 10 |
2009 | 0 | 1 | 0.074 | May 22 | 0.068 | April 28 | 0.067 | Aug 20 | 0.066 | Aug 18 |
2010 | 2 | 2 | 0.081 | July 28 | 0.078 | Sep 2 | 0.069 | July 16 | 0.067 | Sep 7 |
2011 | 1 | 1 | 0.090 | July 21 | 0.069 | July 11 | 0.068 | July 20 | 0.065 | June 28 |
2012 | 2 | 2 | 0.085 | July 17 | 0.078 | July 13 | 0.069 | Aug 17 | 0.068 | April 16 |
2013 | 0 | 0 | 0.070 | April 29 | 0.069 | April 28 | 0.069 | June 1 | 0.068 | Sept 11 |
2014 | 0 | 1 | 0.073 | June 3 | 0.066 | July 23 | 0.065 | April 22 | 0.064 | Sept 5 |
2015 | 0 | 1 | 0.071 | May 4 | 0.062 | Sept 9 | 0.061 | April 13 | 0.061 | Sept 18 |
2016 | 0 | 1 | 0.072 | May 25 | 0.070 | May 27 | 0.066 | July 13 | 0.064 | July 25 |
2017 | 0 | 0 | 0.068 | April 11 | 0.066 | April 10 | 0.064 | April 15 | 0.063 | May 17 |
2018 | 0 | 0 | 0.069 | May 25 | 0.068 | May 2 | 0.067 | July 2 | 0.066 | May 26 |
2019 | 0 | 0 | 0.058 | June 5 | 0.057 | June 15 | 0.057 | March 24 | 0.054 | March 9 |
2020 | 0 | 0 | 0.067 | Aug 11 | 0.060 | July 19 | 0.055 | April 19 | 0.053 | June 23 |
2021 | 0 | 0 | 0.067 | June 6 | 0.064 | May 26 | 0.064 | June 5 | 0.061 | March 11 |
2022 | 0 | 0 | 0.066 | July 1 | 0.064 | Aug 20 | 0.061 | July 24 | 0.058 | Aug 4 |
2023 | 0 | 1 | 0.074 | April 14 | 0.066 | April 13 | 0.066 | June 1 | 0.065 | July 1 |
Portsmouth
Operating from 1982 to Present, Relocated in 2001 |
||||||||||
---|---|---|---|---|---|---|---|---|---|---|
Year | # Days > | 1st High (ppm) | Date | 2nd High (ppm) | Date | 3rd High (ppm) | Date | 4th High (ppm) | Date | |
0.075 | 0.070 | |||||||||
1994 | 9 | 13 | 0.107 | July 21 | 0.092 | Aug 9 | 0.089 | Aug 4 | 0.086 | July 2 |
1995 | 8 | 11 | 0.101 | June 30 | 0.094 | Aug 10 | 0.087 | Aug 1 | 0.085 | Sept 7 |
1996 | 6 | 10 | 0.087 | Aug 8 | 0.084 | July 8 | 0.082 | Aug 7 | 0.079 | Aug 6 |
1997 | 11 | 11 | 0.107 | July 1 | 0.094 | June 21 | 0.090 | Aug 11 | 0.089 | June 30 |
1998 | 10 | 11 | 0.094 | Aug 5 | 0.093 | July 16 | 0.093 | Aug 6 | 0.084 | May 29 |
1999 | 8 | 13 | 0.107 | July 16 | 0.093 | Aug 25 | 0.090 | June 24 | 0.089 | May 31 |
2000 | 2 | 3 | 0.078 | July 2 | 0.076 | June 21 | 0.075 | July 3 | 0.067 | June 25 |
2001* | 0 | 0 | 0.067 | Sept 8 | 0.066 | Aug 9 | 0.062 | Sept 7 | 0.059 | Sept 24 |
2002 | 13 | 16 | 0.104 | Aug 14 | 0.100 | Aug 12 | 0.098 | Aug 13 | 0.090 | July 22 |
2003 | 2 | 6 | 0.081 | June 29 | 0.081 | July 3 | 0.075 | July 21 | 0.073 | Aug 21 |
2004 | 4 | 6 | 0.098 | July 30 | 0.080 | July 23 | 0.080 | Aug 3 | 0.076 | July 22 |
2005 | 2 | 7 | 0.078 | Aug 8 | 0.077 | June 25 | 0.075 | April 20 | 0.075 | June 24 |
2006 | 2 | 4 | 0.077 | June 19 | 0.076 | June 18 | 0.075 | July 15 | 0.073 | July 25 |
2007 | 5 | 9 | 0.082 | May 25 | 0.080 | Aug 3 | 0.080 | Sept 7 | 0.078 | April 23 |
2008 | 1 | 2 | 0.079 | July 18 | 0.072 | July 3 | 0.070 | July 26 | 0.069 | April 23 |
2009 | 1 | 3 | 0.076 | Aug 18 | 0.074 | May 22 | 0.072 | May 21 | 0.070 | May 20 |
2010 | 2 | 2 | 0.081 | Sep 1 | 0.076 | July 28 | 0.069 | Sep 2 | 0.066 | July 21 |
2011 | 1 | 3 | 0.086 | July 21 | 0.072 | July 11 | 0.071 | July 20 | 0.064 | July 12 |
2012 | 1 | 2 | 0.083 | July 13 | 0.073 | June 29 | 0.070 | April 16 | 0.070 | July 17 |
2013 | 1 | 2 | 0.076 | Aug 21 | 0.072 | June 21 | 0.068 | June 1 | 0.066 | Aug 22 |
2014 | 0 | 1 | 0.072 | Sept 5 | 0.070 | June 2 | 0.070 | July 22 | 0.068 | June 30 |
2015 | 1 | 1 | 0.078 | Sept 18 | 0.067 | May 4 | 0.065 | Aug 3 | 0.065 | Aug 18 |
2016 | 0 | 0 | 0.067 | July 6 | 0.063 | July 28 | 0.062 | Aug 11 | 0.062 | Aug 25 |
2017 | 0 | 0 | 0.066 | June 12 | 0.064 | April 10 | 0.064 | May 17 | 0.064 | June 10 |
2018 | 0 | 0 | 0.065 | May 2 | 0.064 | May 25 | 0.064 | July 5 | 0.061 | April 24 |
2019 | 0 | 0 | 0.068 | July 30 | 0.056 | July 5 | 0.053 | July 29 | 0.052 | Sept 22 |
2020 | 0 | 0 | 0.064 | Aug 11 | 0.060 | Aug 10 | 0.058 | July 19 | 0.053 | Aug 24 |
2021 | 0 | 0 | 0.064 | June 6 | 0.062 | May 26 | 0.061 | June 2 | 0.059 | June 18 |
2022 | 0 | 1 | 0.071 | July 1 | 0.070 | Aug 4 | 0.066 | July 20 | 0.062 | June 26 |
2023 | 0 | 0 | 0.062 | June 1 | 0.061 | April 14 | 0.060 | April 13 | 0.060 | May 12 |
*Site did not meet 75% minimum data completeness requirement. |
Rochester
Operating from 1996 to 2003 |
||||||||||
---|---|---|---|---|---|---|---|---|---|---|
Year | # Days > | 1st High (ppm) | Date | 2nd High (ppm) | Date | 3rd High (ppm) | Date | 4th High (ppm) | Date | |
0.075 | 0.070 | |||||||||
1996 | 4 | 6 | 0.089 | June 2 | 0.088 | Aug 8 | 0.081 | Aug 7 | 0.076 | June 7 |
1997 | 5 | 7 | 0.108 | July 1 | 0.084 | June 21 | 0.084 | Aug 11 | 0.080 | July 27 |
1998 | 5 | 7 | 0.082 | July 17 | 0.080 | July 16 | 0.079 | May 29 | 0.079 | July 14 |
1999 | 8 | 10 | 0.094 | June 1 | 0.090 | Aug 25 | 0.084 | July 17 | 0.084 | July 30 |
2000 | 0 | 2 | 0.072 | June 21 | 0.071 | June 16 | 0.070 | June 17 | 0.065 | July 2 |
2001 | 5 | 10 | 0.104 | June 19 | 0.081 | June 14 | 0.078 | May 12 | 0.078 | Sept 8 |
2002 | 9 | 13 | 0.105 | Aug 14 | 0.095 | Aug 12 | 0.093 | Aug 18 | 0.090 | Aug 11 |
2003 | 3 | 4 | 0.079 | April 15 | 0.079 | July 3 | 0.077 | June 29 | 0.072 | Aug 29 |
Rye
Operating from 1987 to Present, Relocated in 2003 |
||||||||||
---|---|---|---|---|---|---|---|---|---|---|
Year | # Days > | 1st High (ppm) | Date | 2nd High (ppm) | Date | 3rd High (ppm) | Date | 4th High (ppm) | Date | |
0.075 | 0.070 | |||||||||
1994 | 16 | 21 | 0.118 | July 21 | 0.101 | July 20 | 0.101 | Aug 4 | 0.097 | June 17 |
1995 | 7 | 10 | 0.105 | June 30 | 0.103 | Aug 1 | 0.099 | July 13 | 0.098 | Aug 10 |
1996 | 9 | 15 | 0.090 | July 12 | 0.090 | July 18 | 0.088 | Aug 7 | 0.087 | Aug 6 |
1997 | 13 | 16 | 0.121 | June 30 | 0.110 | June 21 | 0.103 | July 1 | 0.102 | June 29 |
1998 | 8 | 11 | 0.100 | July 16 | 0.099 | Aug 5 | 0.086 | July 15 | 0.085 | May 29 |
1999 | 11 | 15 | 0.111 | July 16 | 0.096 | May 31 | 0.085 | Aug 17 | 0.084 | Aug 25 |
2000 | 1 | 2 | 0.081 | July 3 | 0.073 | July 2 | 0.070 | June 21 | 0.068 | July 4 |
2001 | 12 | 14 | 0.106 | June 20 | 0.095 | June 19 | 0.094 | May 4 | 0.093 | Aug 2 |
2002 | 17 | 22 | 0.110 | Aug 14 | 0.099 | Aug 13 | 0.089 | June 21 | 0.089 | July 2 |
2003 | 2 | 5 | 0.078 | June 27 | 0.077 | June 25 | 0.073 | June 26 | 0.071 | July 3 |
2004 | 2 | 3 | 0.093 | July 30 | 0.078 | Aug 3 | 0.075 | July 23 | 0.074 | Aug 10 |
2005 | 3 | 6 | 0.082 | July 27 | 0.079 | April 20 | 0.076 | June 24 | 0.075 | Aug 8 |
2006 | 5 | 6 | 0.077 | July 10 | 0.077 | July 25 | 0.076 | June 18 | 0.076 | June 19 |
2007 | 8 | 10 | 0.097 | Aug 3 | 0.093 | July 26 | 0.091 | June 27 | 0.086 | Sept 7 |
2008 | 3 | 9 | 0.083 | July 18 | 0.078 | July 3 | 0.076 | July 8 | 0.075 | July 9 |
2009 | 2 | 6 | 0.083 | Aug 18 | 0.076 | May 22 | 0.073 | May 21 | 0.068 | May 20 |
2010 | 1 | 3 | 0.081 | Sep 1 | 0.073 | Sep 2 | 0.072 | July 28 | 0.066 | July 5 |
2011 | 2 | 2 | 0.082 | July 21 | 0.077 | July 11 | 0.066 | July 20 | 0.066 | Aug 1 |
2012 | 1 | 2 | 0.077 | July 13 | 0.075 | Aug 23 | 0.070 | June 29 | 0.067 | July 17 |
2013 | 0 | 1 | 0.072 | June 1 | 0.070 | June 21 | 0.070 | Aug 21 | 0.069 | Aug 22 |
2014 | 0 | 3 | 0.074 | Sept 5 | 0.073 | June 30 | 0.071 | July 22 | 0.070 | July 23 |
2015 | 1 | 1 | 0.078 | Sept 18 | 0.067 | May 4 | 0.066 | Sept 17 | 0.065 | May 25 |
2016 | 1 | 1 | 0.077 | July 6 | 0.068 | July 28 | 0.068 | Aug 11 | 0.067 | May 28 |
2017 | 0 | 1 | 0.074 | June 12 | 0.069 | July 20 | 0.068 | Aug 10 | 0.067 | May 17 |
2018 | 0 | 2 | 0.075 | July 10 | 0.071 | Aug 7 | 0.070 | July 5 | 0.069 | July 3 |
2019 | 0 | 1 | 0.074 | July 30 | 0.068 | July 29 | 0.062 | July 20 | 0.060 | July 5 |
2020 | 0 | 0 | 0.067 | Aug 10 | 0.065 | Aug 11 | 0.060 | June 26 | 0.060 | Aug 21 |
2021 | 1 | 2 | 0.077 | Aug 26 | 0.075 | June 6 | 0.070 | May 26 | 0.067 | Aug 7 |
2022 | 1 | 2 | 0.077 | July 20 | 0.074 | July 1 | 0.069 | Aug 4 | 0.068 | July 24 |
2023 | 0 | 0 | 0.069 | July 6 | 0.069 | July 12 | 0.066 | June 1 | 0.066 | June 12 |