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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 113 118 103 113 36 48 84 96 19 26 34 40 7 14
1984 79 88 63 72 34 43 65 75 19 26 42 50 10 14
1985 70 85 58 71 35 48 53 71 15 23 27 38 9 14
1986 53 67 41 58 17 22 32 45 16 16 22 29 6 10
1987 58 74 44 57 20 26 35 45 29 34 27 34 11 16
1988 72 79 62 70 40 49 63 68 37 44 29 41 26 36
1989 62 77 41 57 29 40 43 52 14 28 14 25 5 10
1990 57 68 44 56 21 29 37 50 20 30 18 24 8 17
1991 54 69 46 57 26 34 45 53 22 27 28 31 16 21
1992 47 62 29 38 22 28 36 49 16 22 12 20 11 14
1993 51 60 39 49 20 25 40 50 18 25 11 14 9 13
1994 53 70 39 57 22 27 39 48 21 31 21 28 13 20
1995 48 60 35 45 23 29 33 47 19 27 18 22 13 20
1996 44 56 33 40 20 27 28 40 14 21 12 14 4 8
1997 47 58 34 44 16 23 38 49 16 24 19 19 11 16
1998 52 69 44 53 22 36 36 48 14 19 11 18 5 11
1999 50 62 43 54 21 26 36 47 19 30 16 22 11 18
2000 27 39 23 31 5 13 16 27 5 7 14 17 2 7
2001 47 59 39 41 22 29 37 46 22 32 26 33 6 15
2002 53 60 49 55 28 31 43 56 23 32 33 37 13 19
2003 34 51 26 38 15 24 27 38 10 23 13 18 4 6
2004 28 38 20 27 11 16 16 28 10 18 5 12 4 6
2005 43 57 30 42 15 23 31 44 17 28 17 23 4 10
2006 37 45 29 34 10 17 26 34 11 18 13 19 0 2
2007 53 62 42 53 14 18 38 47 22 29 18 28 5 8
2008 39 45 22 32 4 10 18 29 10 22 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 25 8 13 6 11 0 3
2011 16 24 14 20 3 8 10 15 2 5 6 11 1 1
2012 29 39 37 34 4 6 17 28 3 14 11 17 0 1
2013 20 27 18 23 5 9 6 13 3 6 7 11 0 1
2014 9 20 8 16 0 3 0 5 1 4 0 2 0 0
2015* 24 38 22 32 2 5 3 15 3 7 4 10 0 0
*2015 data preliminary and subject to change.

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