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 >
Year	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
2017	17	25	10	20	5	6	6	12	3	5	5	6	0	1
2018	18	28	17	23	2	3	6	12	1	6	5	12	0	1
2019	14	24	12	21	0	1	2	5	0	1	1	2	0	0
2020	9	18	9	17	0	1	1	3	0	0	2	4	0	0
2021	18	23	16	21	3	4	2	4	2	3	2	5	0	0
2022*	14	24	12	23	1	2	1	4	1	2	3	5	0	0

*2022 data preliminary and subject to change.