Wildfire warnings spread across US and Canada.

Five states in the US are under red flag warnings due to hot, dry and unstable conditions, which could lead to the spread of wildfires. The National Weather Service has warned residents to be careful with any activities that could potentially lead to a wildfire. Millions of Americans are also exposed to unsafe air quality levels due to wildfires in Canada, which have prompted air quality alerts in several US states. The smoke and haze from the wildfires have impacted US air quality, and insurance companies like Allstate and State Farm are no longer offering new policies in California due to wildfire risks.