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Region 1: EPA New England

Historical Exceedance Days in New England

The chart below shows the number of days air quality monitors in each New England state recorded ozone concentrations exceeding the 2008 8-hour ozone standard (that is, days greater than 0.075 parts per million (ppm)), as well as the number of days exceeding the 2015 8-hour ozone standard (that is, days greater than 0.070 ppm).

Exceedance Days Per Area (Click on an area for a graph of the data)
Year New England
# days >
CT
# days >
ME
# days >
MA
# days >
NH
# days >
RI
# days >
VT
# days >
0.075 0.070 0.075 0.070 0.075 0.070 0.075 0.070 0.075 0.070 0.075 0.070 0.075 0.070
1983 113 118 103 111 36 43 84 95 19 29 34 40 7 12
1984 79 88 63 70 34 42 65 72 19 25 42 51 10 14
1985 70 85 58 72 35 47 53 68 15 21 27 38 9 14
1986 53 67 41 57 17 19 32 43 16 16 22 29 6 10
1987 58 74 44 57 20 27 35 46 29 34 27 34 11 16
1988 72 79 62 70 40 46 63 65 37 42 29 40 26 35
1989 62 77 41 55 29 27 43 44 14 23 14 22 5 9
1990 57 68 44 56 21 29 37 50 20 28 18 24 8 17
1991 54 69 46 57 26 33 45 52 22 25 28 31 16 21
1992 47 62 29 38 22 27 36 49 16 20 12 20 11 13
1993 51 60 39 49 20 26 40 51 18 25 11 14 9 13
1994 53 70 39 57 22 27 39 49 21 33 21 28 13 11
1995 48 60 35 44 23 32 33 48 19 27 18 22 13 13
1996 44 56 33 39 20 29 28 38 14 21 12 14 4 10
1997 47 58 34 44 16 25 38 48 16 23 19 19 11 9
1998 52 69 44 53 22 36 36 51 14 19 11 18 5 11
1999 50 62 43 54 21 27 36 47 19 29 16 22 11 18
2000 27 39 23 31 5 14 16 25 5 6 14 17 2 6
2001 47 59 39 41 22 30 37 48 22 31 26 33 9 16
2002 53 60 49 55 28 29 43 56 23 30 33 37 13 19
2003 34 51 26 37 15 19 27 38 10 21 13 18 4 7
2004 28 38 20 26 11 17 16 29 10 15 5 12 4 5
2005 43 57 30 41 15 22 31 47 17 26 17 23 4 10
2006 37 45 29 34 10 16 26 34 11 18 13 19 0 3
2007 53 62 42 54 14 17 38 48 22 24 18 28 5 7
2008 39 45 22 32 4 10 18 29 10 20 6 13 3 4
2009 11 19 6 18 3 5 8 11 2 5 1 6 0 3
2010 29 45 24 37 8 9 14 23 8 11 6 11 0 3
2011 16 24 14 20 3 7 10 15 2 4 6 11 1 1
2012 29 39 37 36 4 5 17 27 3 12 11 17 0 1
2013 20 27 18 23 5 8 6 13 3 6 7 11 0 1
2014 9 20 8 16 0 3 0 4 1 4 0 2 0 0
2015 24 38 22 33 2 4 3 15 3 7 4 10 0 0
2016 21 32 21 31 1 4 7 11 0 5 4 6 0 1
*2016 data preliminary and subject to change.

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