VERMONT

For 1999 and after, click on the date for the corresponding eight-hour average peak ozone map for that day.

In October 2015, EPA revised the 8-hour ozone standard and changed the Air Quality Index (AQI) to align with this new standard. Maps for days in 2007 and earlier are based on the 1997 8-hour ozone standard (0.08 ppm). Maps for 2008 through 2015 are based on the 2008 ozone standard (0.075 ppm). Maps for 2016 through 2022 are based on the 2015 ozone standard (0.070 ppm). Click Here for a table showing the revised AQI breakpoints for the 1997, 2008, and 2015 ozone standards.

Bennington | Rutland | Underhill

Bennington Operating from 1986 to Present
Year	# Days >		1st High (ppm)	Date	2nd High (ppm)	Date	3rd High (ppm)	Date	4th High (ppm)	Date
Year	0.075	0.070	1st High (ppm)	Date	2nd High (ppm)	Date	3rd High (ppm)	Date	4th High (ppm)	Date
1994	7	10	0.094	Aug 4	0.091	April 15	0.084	Aug 4	0.083	May 31
1995	7	10	0.085	June 18	0.079	July 13	0.078	June 6	0.078	Aug 1
1996	4	10	0.093	May 20	0.090	June 2	0.088	June 7	0.079	Aug 8
1997	6	9	0.097	June 30	0.093	Aug 10	0.083	June 12	0.082	Aug 11
1998	3	7	0.083	July 27	0.081	May 29	0.077	May 28	0.075	July 15
1999	11	18	0.094	July 16	0.092	July 31	0.086	June 27	0.083	July 15
2000	1	4	0.091	June 10	0.074	June 21	0.073	June 25	0.071	May 6
2001	9	15	0.093	June 19	0.087	May 4	0.084	May 2	0.083	May 11
2002	11	17	0.091	Aug 14	0.088	Aug 13	0.088	Sept 14	0.086	Aug 12
2003	3	5	0.082	June 25	0.081	April 15	0.076	June 29	0.073	July 4
2004	3	5	0.089	July 22	0.083	June 24	0.076	Aug 10	0.064	July 1
2005	3	9	0.081	June 9	0.081	June 25	0.077	April 20	0.072	April 17
2006	1	3	0.076	March 31	0.073	July 10	0.071	June 18	0.068	May 25
2007	4	7	0.080	June 8	0.080	Sept 7	0.079	April 23	0.077	May 25
2008	2	3	0.084	April 19	0.078	July 12	0.071	April 18	0.069	April 22
2009	0	0	0.075	April 27	0.074	May 22	0.072	May 21	0.068	May 20
2010	0	3	0.071	June 19	0.071	Sep 24	0.069	Sep 1	0.068	July 4
2011	1	1	0.082	July 20	0.064	June 8	0.062	July 11	0.059	July 17
2012	0	1	0.073	April 16	0.070	Aug 9	0.069	July 13	0.067	May 13
2013	0	1	0.071	April 28	0.064	May 1	0.064	May 2	0.062	April 29
2014	0	0	0.067	April 13	0.065	May 12	0.063	May 27	0.061	April 21
2015	0	0	0.069	May 4	0.067	May 8	0.067	May 25	0.063	Sept 19
2016	0	1	0.074	May 25	0.070	May 26	0.070	May 27	0.067	June 27
2017	0	1	0.071	April 10	0.068	April 11	0.066	June 12	0.065	April 15
2018	0	1	0.071	May 25	0.070	May 26	0.068	May 2	0.065	April 24
2019	0	0	0.061	July 11	0.060	Mar 30	0.056	Mar 14	0.056	June 5
2020	0	0	0.057	Aug 11	0.055	June 23	0.053	April 19	0.053	June 10
2021	0	0	0.065	May 21	0.065	June 18	0.063	June 5	0.063	June 6
2022	0	0	0.062	July 1	0.060	June 26	0.058	May 9	0.057	April 13

Rutland Operating from 2016 to Present
Year	# Days >		1st High (ppm)	Date	2nd High (ppm)	Date	3rd High (ppm)	Date	4th High (ppm)	Date
Year	0.075	0.070	1st High (ppm)	Date	2nd High (ppm)	Date	3rd High (ppm)	Date	4th High (ppm)	Date
2016	0	0	0.066	May 27	0.066	June 20	0.065	May 25	0.063	Aug 11
2017	0	0	0.066	April 15	0.064	June 12	0.063	April 10	0.063	June 10
2018	0	0	0.067	May 2	0.065	May 25	0.064	April 24	0.063	May 26
2019	0	0	0.054	Mar 9	0.054	July 28	0.053	Mar 24	0.052	April 13
2020	0	0	0.054	May 3	0.053	July 19	0.053	Aug 11	0.052	June 5
2021	0	0	0.062	June 6	0.060	May 21	0.057	June 2	0.056	Mar 11
2022	0	0	0.061	July 1	0.056	July 17	0.055	June 6	0.054	Aug 20

Underhill Operating from 1989 to Present
Year	# Days >		1st High (ppm)	Date	2nd High (ppm)	Date	3rd High (ppm)	Date	4th High (ppm)	Date
Year	0.075	0.070	1st High (ppm)	Date	2nd High (ppm)	Date	3rd High (ppm)	Date	4th High (ppm)	Date
1994	2	8	0.077	June 11	0.076	May 31	0.075	April 15	0.075	June 5
1995	3	7	0.080	Oct 13	0.078	June 17	0.078	June 18	0.074	June 30
1996	1	1	0.090	June 2	0.068	Aug 7	0.067	April 20	0.065	Aug 8
1997	0	4	0.075	Aug 10	0.073	April 30	0.072	June 30	0.072	July 1
1998	3	7	0.082	July 15	0.076	April 15	0.076	May 28	0.073	April 30
1999	6	9	0.088	July 31	0.080	July 16	0.079	June 1	0.079	June 24
2000	1	3	0.080	May 4	0.074	June 25	0.072	June 24	0.071	Sept 20
2001	4	6	0.082	May 2	0.078	May 11	0.077	May 3	0.076	June 19
2002	9	10	0.096	Aug 14	0.089	Sept 14	0.085	Sept 10	0.084	Aug 12
2003	1	5	0.077	April 28	0.075	April 15	0.074	June 25	0.074	June 29
2004	2	3	0.079	April 30	0.078	June 24	0.071	July 22	0.071	July 23
2005	1	3	0.083	Sept 14	0.075	April 17	0.073	June 25	0.069	May 11
2006	1	1	0.077	March 31	0.070	June 18	0.066	May 25	0.065	May 26
2007	4	5	0.087	May 25	0.078	Sept 7	0.077	April 23	0.077	May 24
2008	2	4	0.083	April 18	0.076	April 19	0.072	April 22	0.070	April 20
2009	0	0	0.068	May 21	0.063	April 25	0.063	April 27	0.061	May 22
2010	0	1	0.071	April 3	0.067	April 2	0.064	July 4	0.063	Sep 3
2011	0	0	0.064	June 1	0.062	April 10	0.059	June 8	0.058	May 13
2012	0	0	0.070	July 14	0.066	June 21	0.066	Aug 4	0.065	April 16
2013	0	0	0.064	May 1	0.062	March 31	0.062	April 7	0.062	April 29
2014	0	0	0.062	April 21	0.061	April 10	0.060	April 13	0.059	April 14
2015	0	0	0.070	May 9	0.068	May 4	0.068	May 8	0.066	Sept 19
2016	0	0	0.064	June 20	0.063	May 25	0.063	May 27	0.060	May 12
2017	0	0	0.062	May 17	0.061	June 11	0.061	June 12	0.060	April 11
2018	0	0	0.066	May 2	0.063	April 24	0.063	May 10	0.062	May 9
2019	0	0	0.056	Mar 30	0.055	Mar 28	0.054	Mar 14	0.054	Mar 20
2020	0	0	0.058	May 22	0.056	May 27	0.056	Mar 9	0.056	June 5
2021	0	0	0.065	May 21	0.065	June 6	0.062	June 2	0.061	Mar 11
2022	0	0	0.063	Mar 17	0.058	July 1	0.057	May 9	0.056	Mar 6

Ground-level Ozone Home Page.

Eight-hour Average Ozone Concentrations Page.