Region 1: EPA New England

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 and 2017 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 | 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
0.075 0.070
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

Top of Page

Underhill
Operating from 1989 to Present
Year # Days > 1st High (ppm) Date 2nd High (ppm) Date 3rd High (ppm) Date 4th High (ppm) Date
0.075 0.070
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 o 0.062 May 17 0.061 June 11 0.061 June 12 0.060 April 11

Top of Page

Ground-level Ozone Home Page.

Eight-hour Average Ozone Concentrations Page.