Region 1: EPA New England

NEW HAMPSHIRE

For 1999 and after, 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 2019 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 | 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

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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