Canadian wildfires are causing the worst air in the US in cities like Chicago and Detroit

 CHICAGO — (AP) — Drifting smoke from the ongoing wildfires across Canada is creating curtains of haze and raising air quality concerns throughout the Great Lakes region and in parts of the central and eastern United States.

The Environmental Protection Agency's AirNow.gov site showed parts of Illinois, lower Michigan and southern Wisconsin had the worst air quality in the U.S. on Tuesday afternoon, and Chicago, Detroit and Milwaukee had air quality categorized as "very unhealthy."

In Minnesota, a record 23rd air quality alert was issued Tuesday through late Wednesday night across much of the state, as smoky skies obscure the skylines of Minneapolis and St. Paul. Michigan's Department of Environment, Great Lakes, and Energy issued an air quality alert for the entire state. Wisconsin's Department of Natural Resources also issued an air quality advisory for the state.