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

Ozone Planning Efforts

Connecticut has persistently been designated  nonattainment for national ambient air quality standards for ozone.  Nonattainment is mainly due to transport of pollutants from the New York metropolitan area reacting to form ozone as they travel across Connecticut.  Connecticut DEEP has been working with neighboring states and the EPA to reduce local and regional emissions that cause ozone.  These emissions reductions strategies are documented below.
All documents are PDF unless otherwise noted.


2015 NAAQS




Final Good Neighbor SIP. Submitted to EPA on December 6, 2018.


Proposed Good Neighbor SIP, September 18, 2018.  Comment Period Closed October 18, 2018.






















 2008 NAAQS 



























1997 NAAQS

















1979 NAAQS
1979 Standard Boundaries
Request for Termination of CAA Section 185 Fee Requirements Cover letter  and Technical Support Document . December 29, 2017


1-hour Ozone Mid-Course Review Cover Letter  and Technical Report  submitted to EPA. January 10, 2005

SIP dated October 15, 2001

Content Last Updated on November 17, 2021