Connecticut Department of Energy and Environmental Protection

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Annual Summary Information for Ozone

Prior to 2008, the 8-hour ozone exceedance day tables reflect the 1997 NAAQS (84 ppb) and from 2008 forward, the tables reflect the 2008 NAAQS (75 ppb).  Tables from 2016 forward reflect the 2015 NAAQS (70 ppb). EPA's 2004 Implementation Rule revoked the 1-hour NAAQS, effective June 15, 2005, but states are not allowed to backslide from existing 1-hour ozone requirements. Note that the ozone season was expanded in 2017 to include March through September.
Year  2019 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009
8-hr Ozone
Exceedance Days 
21
 23  20  31  22  8  18  27  14  24  6 
Year   2008 2007  2006  2005  2004  2003  2002  2001  2000  1999  1998
8-hr Ozone
Exceedance Days
 22  17  13  20  6  14  36  26  15  33 
25

Current Year 8-Hour Ozone Tables
2019
8-hour Tables March April May June  July August Sept
Year                           Previous Year Ozone Tables 
                               
2018                            1-hour Ozone                        8-hour Ozone
2017                            1-hour Ozone                        8-hour Ozone
2016                            1-hour Ozone                        8-hour Ozone
2015                            1-hour Ozone                        8-hour Ozone
2014                            1-hour Ozone                        8-hour Ozone
2013                            1-hour Ozone                        8-hour Ozone
2012                            1-hour Ozone                        8-hour Ozone
2011                            1-hour Ozone                        8-hour Ozone
2010                            1-hour Ozone                        8-hour Ozone
2009                            1-hour Ozone                        8-hour Ozone
2008                            1-hour Ozone                        8-hour Ozone
2007                            1-hour Ozone                        8-hour Ozone
2006                            1-hour Ozone                        8-hour Ozone
2005                            1-hour Ozone                        8-hour Ozone
2004                            1-hour Ozone                        8-hour Ozone
2003                            1-hour Ozone                        8-hour Ozone
2002                            1-hour Ozone                        8-hour Ozone
2001                            1-hour Ozone                        8-hour Ozone
2000                            1-hour Ozone                        8-hour Ozone
1999                            1-hour Ozone                        8-hour Ozone
1998                            1-hour Ozone                        8-hour Ozone
  
Content last updated on October 7, 2019