All customer facing DEEP services have returned to normal business operations. For detailed information on what this means, visit our “New Normal” website: DEEP New Normal Information

Air Quality Summaries and Trends

Air Quality Trends in Connecticut

Air quality trends are used to demonstrate how today's air quality compares with historic observations to assess whether the air quality is improving and to determine if control and abatement strategies are effective. These air quality plots show the relative trends through the latest year available.  Choose the following links for the latest pollutant trend graphs:

Ozone • PM2.5 • Carbon Monoxide • Nitrogen Dioxide • Sulfur Dioxide • Lead

Annual Air Quality Summaries and Reports

Annual Summaries of Ozone Exceedance Days

Note: Annual reports are no longer prepared. CT DEEP discontinued the Annual Air Quality Summary as of year 1999. New England annual reports by the EPA are posted below for 2000-2012.

2012 EPA Annual Report on Air Quality in New England

2011 EPA Annual Report on Air Quality in New England

2010 EPA Annual Report on Air Quality in New England 

2009 EPA Annual Report on Air Quality in New England

2008 EPA Annual Report on Air Quality in New England

2007 EPA Annual Report on Air Quality in New England

2006 EPA Annual Report on Air Quality in New England

2005 EPA Annual Report on Air Quality in New England

2004 EPA Annual Report on Air Quality in New England

2003 EPA Annual Report on Air Quality in New England

2002 EPA Annual Report on Air Quality in New England

2001 EPA Annual Report on Air Quality in New England

2000 EPA Annual Report on Air Quality in New England  

1999 Annual Air Quality Summary

1998 Annual Air Quality Summary 

1997 Annual Air Quality Summary 

1996 Annual Air Quality Summary 

1995 Annual Air Quality Summary

1994 Annual Air Quality Summary

1993 Annual Air Quality Summary

1992 Annual Air Quality Summary 

1991 Annual Air Quality Summary 

1990 Annual Air Quality Summary

1989 Annual Air Quality Summary 

1988 Annual Air Quality Summary 

1987 Annual Air Quality Summary 

1986 Annual Air Quality Summary 

1985 Annual Air Quality Summary

1984 Annual Air Quality Summary

1983 Annual Air Quality Summary

1982 Annual Air Quality Summary

1981 Annual Air Quality Summary

1980 Annual Air Quality Summary 

1979 Annual Air Quality Summary

1978 Annual Air Quality Summary

1977 Annual Air Quality Summary

1976 Annual Air Quality Summary 

1975 Annual Air Quality Summary 

1974 Annual Air Quality Summary

1973 Annual Air Quality Summary 

 

Content last updated on September 28, 2018