Wildfire Smoke Blots Sun and Prompts Health Alerts in Much of U.S.
The smoke was pouring across the border from Canada, where hundreds of wildfires remain unchecked, and the hazardous smoke conditions are expected to linger through Wednesday and perhaps until later in the week.
The smoke was pouring across the border from Canada, where hundreds of wildfires remain unchecked, and the hazardous smoke conditions are expected to linger through Wednesday and perhaps until later in the week.
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