Americans under air quality alert as wildfire smoke clouds cities | USA TODAY

Millions of Americans are under air quality alert as New York City Mayor Eric Adams handed out masks to residents to combat health threats.

RELATED: Wildfire smoke brings eerie skies, dangerous air to northeastern US https://youtu.be/kSVdj5L1F_0

New Yorkers woke up to the worst urban air quality in the world Thursday and millions of Americans could face days or even weeks of smoky siege from the drifting haze of unrelenting Canadian wildfires.

The low-pressure system adrift over Maine and Nova Scotia that has helped funnel the ashen air will probably be “hanging around at least for the next few days,” National Weather Service meteorologist Bryan Ramsey said. Conditions are likely to remain unhealthy until the wind direction changes or the fires are doused, he said.

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