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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 1997 8-hour ozone standard (that is, days greater than 0.084 parts per million (ppm)), as well as the number of days exceeding the 2008 8-hour ozone standard (that is, days greater than 0.075 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 >
0.084 0.075 0.084 0.075 0.084 0.075 0.084 0.075 0.084 0.075 0.084 0.075 0.084 0.075
1983 90 113 84 103 21 36 62 84 10 18 24 34 4 7
1984 60 79 54 63 25 34 44 65 10 20 28 42 4 10
1985 50 70 41 58 21 35 38 53 8 16 16 27 6 9
1986 35 53 28 41 9 17 24 32 9 16 12 22 1 6
1987 46 58 37 44 10 20 23 35 13 28 18 27 3 11
1988 56 72 50 62 35 40 43 63 27 37 19 29 14 26
1989 31 62 26 41 16 21 21 43 11 16 9 14 2 5
1990 31 57 24 44 15 21 22 37 9 20 13 18 5 8
1991 40 54 34 46 17 26 26 45 13 22 20 28 10 16
1992 27 47 19 29 12 22 20 36 8 18 5 12 6 11
1993 30 51 27 39 14 20 23 40 8 17 7 11 4 9
1994 33 53 28 39 10 22 20 39 9 19 8 21 2 13
1995 29 48 24 35 14 20 20 39 9 19 11 18 3 13
1996 20 44 16 33 5 20 15 28 6 14 4 12 3 4
1997 30 47 27 34 11 16 24 38 10 16 11 19 2 11
1998 28 52 25 44 11 16 12 36 7 14 5 11 0 5
1999 35 50 33 43 10 21 22 36 10 19 13 16 3 11
2000 19 27 13 23 3 5 5 16 1 5 8 14 1 2
2001 32 47 26 39 15 22 27 37 11 22 15 26 2 9
2002 43 53 36 49 17 28 30 43 13 23 17 33 5 13
2003 17 34 14 26 5 15 11 27 1 10 10 13 0 4
2004 13 28 6 20 1 11 8 16 5 10 4 5 2 4
2005 26 43 20 30 5 15 17 31 4 17 8 17 0 4
2006 16 37 13 29 2 10 12 26 2 10 3 13 0 0
2007 26 53 17 42 8 14 20 38 8 22 8 18 1 5
2008 13 30 8 22 0 4 9 18 2 10 4 6 0 3
2009 4 11 1 6 2 3 1 8 0 2 0 1 0 0
2010 9 29 5 24 2 8 4 14 0 8 1 6 0 0
2011 11 16 10 14 2 3 5 10 1 2 0 6 0 1
2012 14 29 13 27 0 4 6 17 1 3 3 11 0 0
2013 7 20 7 18 1 5 0 6 0 3 0 7 0 0
2014* 3 9 3 8 0 0 0 0 0 1 0 0 0 0
* 2014 data preliminary and subject to change.

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