Air quality alerts can change quickly during wildfire smoke events. Here’s what Code Orange, Code Red, Code Purple and Code ...

Delaware is under a Code Red air alert due to smoke from Canadian wildfires. What does a code purple mean and what is AQI?

Pittsburgh was under a "Code Red" air quality alert July 16 as wildfire smoke hits the city. What that means.

(WHTM) — If you thought air quality was bad in Code Red conditions, there are two worse levels. The Pennsylvania Department ...

What are "Code Red" and "Code Purple" air quality alerts? The Air Quality Index has six color-coded categories, ranging from cleanest to hazardous.

Excessive heat is on the way for Maryland as wildfire smoke reaches the Mid-Atlantic.READ MORE:What does Code Red air quality mean? Weather Talk explainsCHECK OUT WBAL:Get all the latest Baltimore new ...

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 ...

Add Yahoo as a preferred source to see more of our stories on Google. Excessive heat is on the way for Maryland as wildfire smoke reaches our region.

TORONTO, ON- JULY 15 - A swimmer checks out the view of the smoke from Northern Ontario forest fires that has the City of Toronto skyline shrouded in haze as viewed from Humber Park West in Toronto.