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Why millions in the U.S. are experiencing dangerous air quality levels

Wildfire smoke from Yukon to Nova Scotia is engulfing northeastern U.S. and Canada, choking major cities like New York and Toronto with hazardous air quality.

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Why millions in the U.S. are experiencing dangerous air quality levels
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    Threat level

    Smoke, and other forms of air pollution, drifted over Tuesday and many cities saw among the worst air quality in the world overnight.

    Canadian wildfire smoke drives record poor air quality in East Coast

    Canadian wildfire smoke drives record poor air quality in East Coast

    People hundreds of miles away can be negatively affected by the hazardous microscopic particles they produce, which can trigger inflammation in the lungs when inhaled and can worsen medical conditions like asthma and heart disease.

    Driving the news

    N.Y.C. Mayor Eric Adams issued a statement urging all New Yorkers to limit outdoor activity to the greatest extent possible.

    Go Deeper

    Here's how wildfire smoke and air quality levels affect your health.

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