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The summer of 2023 has seen persistent spikes in dangerous air quality levels across the United States as smoke from ongoing wildfires in Canada is blown south. In early June, the smoke in New York City was so bad it officially had the worst air quality of any major city in the world, according to air quality technology company IQAir. Later in June, much of the Midwest was blanketed by a dangerous haze of air pollution.

This extreme fire event and its long smoke trail indicate a much larger and worrying trend: Wildfires are getting worse, lasting longer, and occurring more frequently, primarily due to climate change.

So, how can you stay safe in America’s smoke-filled future? Follow here for Vox’s coverage of how to interpret the Air Quality Index, how to protect your health as AQI rises, and possible solutions to air pollution threats in the US.

  • Rebecca Leber

    Rebecca Leber

    The Air Quality Index and how to use it, explained

    A jogger beside a lake with a smoke-blurred skyline in the background.
    A jogger beside a lake with a smoke-blurred skyline in the background.
    Worsening wildfires mean everyone should have a basic understanding of how to read and respond to the Air Quality Index. It’s a good idea to reduce outdoor exercise on hazardous air days to cut down on exposure.
    Kamil Krzaczynski/AFP via Getty Images

    We’re making this story accessible to all readers as a public service. At Vox, our mission is to help everyone access essential information that empowers them. Support our journalism by becoming a member today.

    It’s not enough to trust the senses to know when it’s a bad air day. Well before you can see or smell smoke, it can start wreaking havoc on the lungs.

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  • Rachel DuRose

    Rachel DuRose and Oshan Jarow

    If you can’t breathe well, neither can your pet

    A man walks his dog in front of the skyline of lower Manhattan during heavy smog in New York on June 7, 2023.
    A man walks his dog in front of the skyline of lower Manhattan during heavy smog in New York on June 7, 2023.
    In early June, smoke from Canadian wildfires blanketed New York City, causing hazardous levels of air pollution.
    Angela Weiss/AFP via Getty Images

    Humans aren’t the only ones breathing in deadly, dirty air this week.

    Pets — animals who often have indoor sanctuary — may still have to venture outside when wildfire smoke comes to town. Dogs need their outdoor bathroom breaks, and don’t have the protection of masks, like we do. And if living in poorly sealed buildings without air filters, other pets like cats, rabbits, guinea pigs, and birds, too, can suffer from unhealthy air.

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  • How to make your indoor air better when it’s smoky outside

    A box fan and several air filters sitting on a flat surface.
    A box fan and several air filters sitting on a flat surface.
    Michael Robinson Chávez/The Washington Post via Getty Images

    When the outdoor air hangs thick with wildfire smoke, indoor air gets increasingly foul, too.

    That’s because the air quality inside buildings is a direct reflection of outdoor air quality, said Ian Cull, an environmental engineer and air quality expert based in Chicago. Few buildings (with the notable exceptions of some health care and laboratory settings) are hermetically sealed to prevent them from sharing any air with the outdoors. So people breathing air inside eventually end up breathing whatever’s on the outside.

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  • Benji Jones

    Benji Jones

    Why is eastern Canada on fire — and when will the smoke clear?

    A smoky haze casts an orange glow on uplit  fountains in the foreground and a bridge in the distance.
    A smoky haze casts an orange glow on uplit  fountains in the foreground and a bridge in the distance.
    A view of the Williamsburg Bridge from Domino Park in Brooklyn, New York, on June 7.
    Courtesy of Natalie Kelapire

    East Coasters finally understand what it’s like to live in California.

    Earlier this week, a giant cloud of wildfire smoke from Canada wafted into New York City, Boston, and other eastern metropolises, engulfing skylines and putting millions of people at risk from air pollution. On Tuesday evening, Wednesday, and Thursday morning, NYC had the worst air quality of any major city in the world.

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  • Rebecca Leber

    Rebecca Leber

    The air we breathe was getting better. Then climate change hit.

    Wildfire smoke filling the air over a housing community on a hillside in California.
    Wildfire smoke filling the air over a housing community on a hillside in California.
    One in three people in the US lives in a county with unhealthy air, according to the 2023 State of the Air report.
    David McNew/Getty Images

    Editor’s note, June 7: Wildfires in Canada are causing widespread air quality issues across the eastern United States. Our story on how wildfires and heat are worsening air pollution, originally published on April 19, follows.

    For more than two decades, the American Lung Association (ALA) has posed a simple question: Is air pollution in the United States getting better or worse?

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  • Smoky air puts everyone at risk — but it’s worse for some

    A woman wears a face mask as smoke hides the sun rising behind the skyline of Manhattan in New York City on June 7, 2023.
    A woman wears a face mask as smoke hides the sun rising behind the skyline of Manhattan in New York City on June 7, 2023.
    Smoke from wildfires in Canada has blanketed New York City, raising the alarm for those at risk from air pollution.
    Kena Betancur/VIEWpress/Getty Images

    When wildfires send billows of smoke into the air for days on end, people even thousands of miles downwind often notice the change in air quality in their eyes and airways — and it’s a big strain on health.

    “Particles, gases, volatile organic compounds in the air can cause inflammation in everyone,” said Daniel Croft, a pulmonologist and air quality researcher at the University of Rochester Medical Center in upstate New York. “This is a health risk for all people.”

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  • Umair Irfan

    Umair Irfan

    We can’t just run away from wildfires

    A woman talks on her phone while stopped in heavy traffic on Hwy 50 as people evacuate ahead of the Caldor Fire on August 30, 2021, in South Lake Tahoe, California.
    A woman talks on her phone while stopped in heavy traffic on Hwy 50 as people evacuate ahead of the Caldor Fire on August 30, 2021, in South Lake Tahoe, California.
    Residents of South Lake Tahoe, California, were forced to flee as the Caldor Fire approached the city at the end of August.
    Justin Sullivan/Getty Images

    It has been yet another breathtaking year for disasters. While Hurricane Ida drenched a path from New Orleans to New York, leaving flooding and power outages in its wake, wildfires forced thousands to evacuate and sent choking smoke across the US.

    Such disasters are a fact of life in many parts of the country, and the risks are only growing as human activity continues to warm the planet. For those living in the West within reach of devastating blazes, that raises a difficult question: Should I stay or should I go?

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