The Canadian wildfire smoke that covered northwest Wisconsin July 24 has moved south and is causing air quality problems in most of the state.

An air quality alert will be in effect across all of Minnesota until at least 11 p.m. July 25, according to the state Pollution Control Agency.

Heavy smoke from wildfires in Saskatchewan and Manitoba is moving south, impacting air quality. The MPCA anticipates that air quality will improve gradually starting Friday afternoon as southerly winds push the smoke north.