Extreme temperature warnings in place as ‘heat dome’ bakes US

Warnings about dangerous, unhealthy air also extended from Minnesota to New York as wildfires rage in Toronto

Extreme heat warnings are in place for large swaths of the United States this week, as an unusual weather pattern eclipses record temperature highs.

In Billings, Montana, residents experienced a sweltering 111F (43.9C) on Sunday, the hottest day in its history. Salt Lake City in Utah also hit an all-time record high on Sunday at 109F. Boston has seen more 90F days than average, according to NPR station WBUR-FM.