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 |
# days > |
# days > |
# days > |
# days > |
# days > |
# days > |
# 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 | |
| 90 | 113 | 84 | 103 | 21 | 36 | 62 | 84 | 10 | 18 | 24 | 34 | 4 | 7 | |
| 60 | 79 | 54 | 63 | 25 | 34 | 44 | 65 | 10 | 20 | 28 | 42 | 4 | 10 | |
| 50 | 70 | 41 | 58 | 21 | 35 | 38 | 53 | 8 | 16 | 16 | 27 | 6 | 9 | |
| 35 | 53 | 28 | 41 | 9 | 17 | 24 | 32 | 9 | 16 | 12 | 22 | 1 | 6 | |
| 46 | 58 | 37 | 44 | 10 | 20 | 23 | 35 | 13 | 28 | 18 | 27 | 3 | 11 | |
| 56 | 72 | 50 | 62 | 35 | 40 | 43 | 63 | 27 | 37 | 19 | 29 | 14 | 26 | |
| 31 | 62 | 26 | 41 | 16 | 21 | 21 | 43 | 11 | 16 | 9 | 14 | 2 | 5 | |
| 31 | 57 | 24 | 44 | 15 | 21 | 22 | 37 | 9 | 20 | 13 | 18 | 5 | 8 | |
| 40 | 54 | 34 | 46 | 17 | 26 | 26 | 45 | 13 | 22 | 20 | 28 | 10 | 16 | |
| 27 | 47 | 19 | 29 | 12 | 22 | 20 | 36 | 8 | 18 | 5 | 12 | 6 | 11 | |
| 30 | 51 | 27 | 39 | 14 | 20 | 23 | 40 | 8 | 17 | 7 | 11 | 4 | 9 | |
| 33 | 53 | 28 | 39 | 10 | 22 | 20 | 39 | 9 | 19 | 8 | 21 | 2 | 13 | |
| 29 | 48 | 24 | 35 | 14 | 20 | 20 | 39 | 9 | 19 | 11 | 18 | 3 | 13 | |
| 20 | 44 | 16 | 33 | 5 | 20 | 15 | 28 | 6 | 14 | 4 | 12 | 3 | 4 | |
| 30 | 47 | 27 | 34 | 11 | 16 | 24 | 38 | 10 | 16 | 11 | 19 | 2 | 11 | |
| 28 | 52 | 25 | 44 | 11 | 16 | 12 | 36 | 7 | 14 | 5 | 11 | 0 | 5 | |
| 35 | 50 | 33 | 43 | 10 | 21 | 22 | 36 | 10 | 19 | 13 | 16 | 3 | 11 | |
| 19 | 27 | 13 | 23 | 3 | 5 | 5 | 16 | 1 | 5 | 8 | 14 | 1 | 2 | |
| 32 | 47 | 26 | 39 | 15 | 22 | 27 | 37 | 11 | 22 | 15 | 26 | 2 | 9 | |
| 43 | 53 | 36 | 49 | 17 | 28 | 30 | 43 | 13 | 23 | 17 | 33 | 5 | 13 | |
| 17 | 34 | 14 | 26 | 5 | 15 | 11 | 27 | 1 | 10 | 10 | 13 | 0 | 4 | |
| 13 | 28 | 6 | 20 | 1 | 11 | 8 | 16 | 5 | 10 | 4 | 5 | 2 | 4 | |
| 26 | 43 | 20 | 30 | 5 | 15 | 17 | 31 | 4 | 17 | 8 | 17 | 0 | 4 | |
| 16 | 37 | 13 | 29 | 2 | 10 | 12 | 26 | 2 | 10 | 3 | 13 | 0 | 0 | |
| 26 | 53 | 17 | 42 | 8 | 14 | 20 | 38 | 6 | 22 | 8 | 18 | 1 | 5 | |
| 12 | 28 | 8 | 22 | 0 | 3 | 8 | 18 | 2 | 8 | 4 | 6 | 1 | 3 | |
| 5 | 11 | 2 | 6 | 2 | 3 | 2 | 7 | 1 | 2 | 0 | 1 | 0 | 0 | |
* The data for 2009 are preliminary and subject to change.
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