Smoke from widespread Canadian wildfires has spread into the US, particularly affecting the Midwest and Northeast, leading to hazy conditions.

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

Smoke from the more than 700 wildfires burning in Canada is continuing to blanket parts of the Midwest for a final day.