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(BBC News) Air quality at unhealthy levels in parts of US
While large swathes of the US deals with searing heat, poor air quality stretches across the country due to the wildfires in Canada.
A map of North America, shared by AirNow.gov, shows concentrations of PM2.5, the main pollutant in wildfire smoke. Yellow depicts moderate amounts, orange as unhealthy for sensitive groups, and red as unhealthy.
In the city of Pittsburgh, the air quality index is currently at 160, which is deemed as "unhealthy". Pittsburgh is located in the northeast of the country, where you can see the clumps of red in the map above.
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