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 >
Year	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

*Please note that the 2011 data is preliminary and subject to change.

Serving Connecticut, Maine, Massachusetts, New Hampshire, Rhode Island, Vermont, & 10 Tribal Nations

Historical Exceedance Days in New England

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