Smoke from wildfires blazing across Canada is once again wafting over huge portions of the Midwest and worsening air quality, with conditions particularly bad on August 1 in Minnesota, Iowa and Illinois.

Wildfire smoke from Canada is blanketing the skies in the Midwest, leaving millions with dangerous breathing conditions.

Smoke from the Canadian Wildfire has caused an unhealthy air quality index rating in the Peoria area, and medical professionals are urging people at high risk to stay inside and filter the air in their homes.