Delaware Air Quality
Real-time AQI data and air quality trends for 79 cities across Delaware.
Statewide Air Quality Overview
44
Average AQI
381
Good Air Days
155
Moderate Days
Unhealthy Days
161
Highest AQI
Based on 2025 EPA data
Learn About Air Quality
What Is the AQI?
Understand how the Air Quality Index is calculated and what each level means for your health.
Pollutant Guide
Learn about PM2.5, ozone, and other pollutants that affect air quality across Delaware.
National Rankings
Compare Delaware cities to the rest of the US by air quality grade and median AQI.