Add Yahoo as a preferred source to see more of our stories on Google. Delaware is under a "code red" air quality index on July 16 for airborne particles and a "code orange" for ozone due to smoke from ...

Air quality alerts use color-coded categories to show when pollution levels may be unhealthy. Code Orange is unhealthy for sensitive groups, while Code Red is unhealthy for everyone. Code Purple means ...

Philadelphia health officials issued a "Code Red" air quality alert due to Canadian wildfire smoke on Thursday. The Air Quality Index reached "Very Unhealthy" levels, with readings as high as 211 in ...

NEW YORK CITY - Wildfire smoke can push air quality into dangerous territory quickly, triggering color-coded alerts that range from Code Orange to Code Red, Code Purple and even Code Maroon. What we ...

Delaware is under a “code red” air quality index on July 16 for airborne particles and a “code orange” for ozone due to smoke from Canadian wildfires spreading south, along with high temperatures. So ...

The Delaware Department of Natural Resources and Environmental Control issues air quality index alerts based on standards set by the Environmental Protection Agency. The index ranges from green for ...