The Statue of Liberty sits behind a cloud of haze on July 20, 2021 in New York City.

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SANTA MONICA, Calif. — Wildfire smoke from Canada and the American West spread across the United States this week, creating haze-filled skies and unhealthy air quality thousands of miles away in states such as New York, New Jersey and Pennsylvania.

In recent days, more than 80 wildfires have burned nearly 1.3 million acres in the Western United States, which is experiencing a historic climate change-fueled drought that has triggered dangerously arid conditions, according to data from the National Interagency Fire Center.

In southern Oregon, the Bootleg Fire, the largest fire in the U.S. so far this season, has burned nearly 400,000 acres and has become so intense that it’s generating enough heat and energy to change the weather.

The government of British Columbia also declared a state of emergency after blazes caused dozens of evacuation orders. The region is currently experiencing 295 active wildfires, with 15 igniting in the past two days, according to data from the government

The smoke and ash from the wildfires was carried by the jet stream and cross-continental winds, triggering health alerts thousands of miles away.

“Smoke from wildfires across the western U.S. and southern Canada is resulting in air quality issues as far east as portions of the Upper Midwest and even the Northeast U.S.,” the National Weather Service said in a statement.

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Northerly winds transported wildfire smoke from north of the Canadian border to Minnesota, prompting officials in the state to to issue an air-quality alert.

In New York, a thick haze covered Manhattan’s skyline and the air quality index, or AQI, for fine particulate matter reached an unhealthy range well above the threshold of 100 after winds blew smoke from states like California, Oregon, Montana.

Other cities including Philadelphia and Boston also experienced AQI readings above 150, a level that is considered unhealthy for all people and significantly above exposure recommendations from the World Health Organization. Those cities, along with Washington and Baltimore, are under air quality alerts.

More than three-fourths of the West is in severe drought, according to the U.S. Drought Monitor, and climate change has created hotter and drier conditions that spur more intense and frequent wildfires.

While it’s not unprecedented for Western wildfire smoke to travel long distances, the smoke travel is not typically seen until later in the summer and fall. The smoke also usually remains at high levels in the atmosphere and doesn’t affect air quality at lower levels.

Health officials have suggested that people in areas with especially poor air quality should wear filtered masks and avoid strenuous exercise outdoors.



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