What to know about the Canadian and US wildfires and their impact

Wildfires in Ontario have blanketed US and Canadian cities with dangerous smoke.

This newsroom brief was automatically prepared from a monitored public feed and rewritten as a concise summary for readers.

Source attribution: BBC Science. Read the original report at https://www.bbc.co.uk/news/articles/c5ywdl9ne3yo?at_medium=RSS&at_campaign=rss