Operating Restrictions for the Regulated Community

Under regulations, permits and orders administered by the Bureau of Air Management, the regulated community uses the ozone forecast to determine whether certain operating restrictions apply for the forecasted day.  These restrictions are imposed to limit unnecessary emissions of nitrogen oxides (NOx), which contribute to the development of ozone on high ozone days.

Owners of most emergency engines (as defined in RCSA section 22a-174-22e) use the ozone forecast to determine whether they can operate for routine, scheduled testing or maintenance.  Such operations are restricted on days forecasted to have ozone air quality index (AQI) levels classified as unhealthy for sensitive groups (USG), or worse, anywhere in Connecticut. 

Additionally, a limited number of sources operate under an exemption in RCSA section 22a-174-22e(c)(7). Sources operating under the exemption are prohibited from operation on days forecasted to have ozone air quality index (AQI) levels classified as unhealthy for sensitive groups (USG), or worse, anywhere in Connecticut.

Content last updated February 6, 2025