Connecticut Issues Air Quality Alerts

Connecticut frequently issues air quality alerts to safeguard public health.

Managed by the Department of Energy and Environmental Protection (DEEP), these alerts notify residents when pollution levels become hazardous.

The two main culprits are ground-level ozone, or smog, which intensifies during hot summer days, and fine particulate matter (PM2.5), often caused by distant wildfires.

Connecticut’s geography makes it vulnerable to pollution blowing in from other states, while heavy traffic on major highways like I-95 adds to the local burden.

When the AQI exceeds 100, it is deemed unhealthy, and officials advise sensitive groups—such as children, the elderly, and those with respiratory issues—to limit outdoor activities and keep windows closed.

As climate change leads to more frequent extreme weather and wildfire events, air quality alerts are becoming a regular part of life in Connecticut.