Ozone Planning Efforts

Connecticut has persistently been designated  nonattainment for national ambient air quality standards (NAAQS) for ozone.  Nonattainment is mainly due to transport of pollutants from the New York metropolitan area reacting to form ozone as they travel to and 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 in the links below to the various historical revisions in the ozone NAAQS.

2015 Ozone NAAQS Planning Efforts

2008 Ozone NAAQS Planning Efforts

1997 Ozone NAAQS Planning Efforts

1979 Ozone NAAQS Planning Efforts

The following map shows the ozone design values for our multi-State non-attainment areas. A design value is a statistical method that EPA uses to describe the air quality status of a given monitor relative to the level of the National Ambient Air Quality Standards (NAAQS). More information about Connecticut's ozone design value trends can be found on the ozone trends webpage. Learn more about the source contributions to Connecticut's ozone on the source contributions to Connecticut's ozone webpage.

Current Ozone Design Values


Content Last Updated May 12, 2022