The state of Minnesota is entering another in a long string of summer days marred by air quality alerts. Poor air quality will continue through Saturday with lingering wildfire smoke from Canada.

Minneapolis has one of the worst air qualities in the world on Thursday morning, with officials warning the smoky air is unhealthy for everyone.

Canadian wildfire smoke is again prompting a statewide Air Quality Alert with “unhealthy” air already across most of Minnesota according to the Pollution Control Agency. It’s also going to tie the longest stretch of unhealthy air in state history.