Air Quality

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Latest News:

Connecticut's Proposed Emissions Standards for Cars and Trucks: 
In fall 2023, at the direction of the General Assembly, Connecticut proposed adoption of updated emissions standards for light-duty passenger vehicles (cars), and new emissions standards for medium and heavy-duty vehicles (trucks). Those proposed standards were not adopted. They would make new cars and trucks up to 90% cleaner and will require vehicle manufacturers to deliver more zero-emission vehicles and other advanced technology vehicles like plug-in hybrids to Connecticut drivers while also increasing consumer protections. Visit our webpage on these proposed regulations to learn more.

More News:

Reclassification of Southwest Connecticut to Severe Nonattainment for Ozone: 
On April 12, 2022, EPA proposed to determine that three counties in Connecticut currently designated “serious” nonattainment for the 2008 National Ambient Air Quality Standards (NAAQS or standards) for ozone failed to meet attainment of the NAAQS by the attainment date of July 20, 2021. Written comments to EPA must be received on or before June 13, 2022. For more information, go to the reclassification webpage. To learn more about source contribution to ozone, go to the Source Contribution to Connecticut's Ozone webpage.

COVID-19 related updates for the Bureau of Air Management can be found on DEEP's COVID-19 Response Page.

New Air Quality Educational Resources: Are you wondering how DEEP tracks, maintains and evaluates Connecticut’s air quality? Or wondering what we are seeing with recent events? We have got you covered. Check out DEEP’s newest air quality education resource

For more information refer to: Air Current News

Air Quality Forecasts and Monitoring

Air quality is monitored through real time, direct measurements of our ambient air, and is forecasted using complex models to predict future air quality events.  The Agency utilizes both of these methods to protect public health and plan for long term air quality control.  Learn more about the air quality forecast, measuring air quality in Connecticut, and the health effects of air pollution.

Air Quality Planning
Air quality planning is an iterative process that incorporates detailed modeling analyses, assessments of air pollution sources such as mobile sources, continual evaluation of federal and state regulations and creative strategies to address air pollution outside the scope of regulations. Learn more about the sources of air pollution and the strategies to improve air quality in Connecticut, including regulatory programs, incentives and more.

Compliance Assurance
DEEP’s air compliance assurance program utilizes source monitoring, inspection, report review, administrative enforcement and a variety of other tools to ensure that the operation of sources of air pollution and related activities comply with all applicable orders, permits, the Connecticut General Statutes, and the Regulations of Connecticut State Agencies. Learn more about the compliance assurance program, download reporting forms and more.

An emissions inventory is a detailed list of air pollutant emissions associated with the various sources of emissions. View emission inventory information, inventory forms (EMIT access, etc.) and more.

Outreach and Education
Outreach and education is important for both informing the public of the Bureau's data, policy and other planning efforts and, informing the Bureau of the public's perception, needs and other related expertise. Find information about the Bureau's regular stakeholder meeting (SIPRAC), special events, fact sheets, webinars and more.

A variety of air quality permits are issued to ensure that emissions from sources of air pollution do not harm public health or cause significant degradation to air quality. Find emissions statement guidance, permit application forms, Title V permits, modeling guidance and more.

The Radiation Division sets standards for the safe operation of equipment that produces radiation and for the possession, use, storage, transportation and disposal of radioactive material. The division inspects facilities that use radioactive material, x-ray machines and other radiation producing devices and is responsible for responding to reports of accidents and incidents involving radioactive materials. of radiation, emergency response, how to register your emitting devices and more.

Contact Us 

Do you have a technical question regarding air permitting?
Please call the Engineer of the Day at 860-424-4152

Would you like to file a complaint about odors or an air pollution source?
Please call the Air Complaint Line at 860-424-3436 or email


Do you have another air related question?

Please call 860-424-4152


Content Last Updated May 12, 2022