NASA maps a week of Canadian wildfire smoke across North America
A new NASA model visualization traces brown-carbon smoke from July 14 through July 20 as unhealthy air spread through major U.S. and Canadian cities.
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A new NASA model visualization traces brown-carbon smoke from July 14 through July 20 as unhealthy air spread through major U.S. and Canadian cities.

Persistent daytime heat and unusually warm nights are increasing health concerns as a powerful weather system stretches across much of the country.
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