The poor air quality continues to prevail in Illinois as Canadian wildfire smoke migrates south into the U.S. As a result, the Illinois Environmental Protection Agency has issued an Air Pollution Action Day for Friday, Aug. 1. Here's what we know.

Health officials from Minnesota to Maine have issued alerts warning of poor air quality from wildfires burning in Canada. People are advised to limit outdoor exposure.

Smoke from Canadian wildfires has returned to Central Illinois bringing significant reductions in air quality to Central Illinois. Air Quality Alerts have been issued for much of the state through Friday.