DOVER, Del. — Delaware is experiencing a Code Orange Air Quality Action Day today, Tuesday, July 29, 2025. A morning temperature inversion is trapping pollutants near the surface, while calm to light westerly winds limit dispersion and bring regional pollution into the state. Combined with mostly sunny skies and highs in the upper 90s, these conditions increase ozone levels to 101 on the Air Quality Index (AQI), classified as “Unhealthy for Sensitive Groups.” Particulate matter (PM2.5) is forecast at a moderate level of 64.
Sensitive individuals—including children, seniors, and those with respiratory or heart conditions—should limit outdoor activity and avoid strenuous exertion. Air quality is expected to improve Wednesday and Thursday as winds increase and temperatures moderate.
For air quality information, call 302-739-9402. To receive email alerts, send a blank message to join-dnrec_ozone_alerts@lists.state.de.us.
Photo: Delaware DNREC Facebook Page