A person on the subway in New York City wears a mask as smoky haze blankets a neighborhood on Wednesday, June 7.

In pictures: Canadian wildfires impact US air quality

A person on the subway in New York City wears a mask as smoky haze blankets a neighborhood on Wednesday, June 7.

David Dee Delgado/Getty Images

Updated 0545 GMT (1345 HKT) June 08, 2023

Smoke from Canadian wildfires has been drifting south into the United States, affecting air quality for millions of people in the Northeast, Midwest and Mid-Atlantic.

New York City’s air quality index peaked above 200 on Tuesday, June 6 — a level of pollution that is “very unhealthy.”

More than 9 million acres have been charred by wildfires this year across Canada — about 15 times the normal burned area for this point in the year.

“Year after year, with climate change, we’re seeing more and more intense wildfires and in places where they don’t normally happen,” Canadian Prime Minister Justin Trudeau said in a news conference.

Workers chain up seats at Citizens Bank Park after the Philadelphia Phillies baseball game was postponed due to poor air quality in Philadelphia on June 7.

Workers chain up seats at Citizens Bank Park after the Philadelphia Phillies baseball game was postponed due to poor air quality in Philadelphia on June 7.

Matt Slocum/AP
As haze and smoke cover the Manhattan skyline, two Orthodox Jewish men stand by the waterfront in Brooklyn on June 7.

As haze and smoke cover the Manhattan skyline, two Orthodox Jewish men stand by the waterfront in Brooklyn on June 7.

Amr Alfiky/Reuters
Smoky haze diminishes the visibility of the Empire State Building in New York on June 7.

Smoky haze diminishes the visibility of the Empire State Building in New York on June 7.

David Dee Delgado/Getty Images
Andrew Elias attempts to photograph the sun obscured by smoke from the Canadian wildfires in Piermont, New York, on June 7.

Andrew Elias attempts to photograph the sun obscured by smoke from the Canadian wildfires in Piermont, New York, on June 7.

John Meore/The Journal News/USA Today Network
Smoke blankets the Lincoln Memorial Reflecting Pool and the National Mall in Washington, DC, on June 7.

Smoke blankets the Lincoln Memorial Reflecting Pool and the National Mall in Washington, DC, on June 7.

Leah Millis/Reuters
A person in Fort Lee, New Jersey, talks on his phone near the George Washington Bridge on June 7.

A person in Fort Lee, New Jersey, talks on his phone near the George Washington Bridge on June 7.

Seth Wenig/AP
Smoke obscures the view from the New York State Thruway, looking north from West Nyack on June 7.

Smoke obscures the view from the New York State Thruway, looking north from West Nyack on June 7.

Peter Carr/The Journal News/USA Today Network
People wear face masks as they walk in New York's Herald Square on June 7.

People wear face masks as they walk in New York’s Herald Square on June 7.

Yuki Iwamura/AP
John and Kristen Carson sit for lunch in Cincinnati on Tuesday, June 6. Smoke from the Canadian wildfires had drifted to the city, causing the air to appear hazy.

John and Kristen Carson sit for lunch in Cincinnati on Tuesday, June 6. Smoke from the Canadian wildfires had drifted to the city, causing the air to appear hazy.

Kareem Elgazzar/The Cincinnati Enquirer/USA Today Network
The sun rises over a hazy New York City skyline on June 7.

The sun rises over a hazy New York City skyline on June 7.

Seth Wenig/AP
People at Toronto's CN Tower take photos of the smoky city on June 6.

People at Toronto’s CN Tower take photos of the smoky city on June 6.

Carlos Osorio/Reuters
A woman jogs along the Hudson River as a smoky haze hangs over the New York City skyline shortly after sunrise on June 7.

A woman jogs along the Hudson River as a smoky haze hangs over the New York City skyline shortly after sunrise on June 7.

Mike Segar/Reuters
The sky is discolored during a New York Yankees baseball game on June 6.

The sky is discolored during a New York Yankees baseball game on June 6.

Frank Franklin II/AP
A smoky sky provides a muted backdrop June 6 at Rock Harbor in Massachusetts. Skies over Cape Cod were filled with smoke from the wildfires in Canada.

A smoky sky provides a muted backdrop June 6 at Rock Harbor in Massachusetts. Skies over Cape Cod were filled with smoke from the wildfires in Canada.

Merrily Cassidy/Cape Cod Times/USA Today Network
People in New York wear masks as they ride bikes on June 6. That morning, the city briefly had the world's worst levels of air pollution.

People in New York wear masks as they ride bikes on June 6. That morning, the city briefly had the world’s worst levels of air pollution.

Selcuk Acar/Anadolu Agency via Getty Images
The Statue of Liberty is obscured by the air pollution in New York on June 6.

The Statue of Liberty is obscured by the air pollution in New York on June 6.

Amr Alfiky/Reuters
Wildfire smoke engulfs downtown Ottawa on Monday, June 5.

Wildfire smoke engulfs downtown Ottawa on Monday, June 5.

Spencer Colby/The Canadian Press via AP
Smoke billows upwards from a planned ignition by firefighters who were tackling the Donnie Creek Complex wildfire south of Fort Nelson, British Columbia, on Saturday, June 3.

Smoke billows upwards from a planned ignition by firefighters who were tackling the Donnie Creek Complex wildfire south of Fort Nelson, British Columbia, on Saturday, June 3.

B.C. Wildfire Service via Reuters
Firefighter Jason Rock sprays hot spots in the Birchtown area while tackling wildfires in Shelburne County, Nova Scotia, on June 3.

Firefighter Jason Rock sprays hot spots in the Birchtown area while tackling wildfires in Shelburne County, Nova Scotia, on June 3.

Communications Nova Scotia via Reuters
An astronaut aboard the International Space Station took this photo of wildfire smoke near Shelburne, Nova Scotia, on May 29. Human-caused climate change has exacerbated the hot and dry conditions that allow wildfires to ignite and grow.

An astronaut aboard the International Space Station took this photo of wildfire smoke near Shelburne, Nova Scotia, on May 29. Human-caused climate change has exacerbated the hot and dry conditions that allow wildfires to ignite and grow.

NASA
Smoke rises from a wildfire in Fort Nelson on May 27.

Smoke rises from a wildfire in Fort Nelson on May 27.

B.C. Wildfire Service via Reuters
Firefighters stand on a truck while battling a blaze near Fort St. John, British Columbia, on May 14.

Firefighters stand on a truck while battling a blaze near Fort St. John, British Columbia, on May 14.

Kamloops Fire Rescue via Reuters
BJ Fuchs, a farmer who has lost some land and had to move his cattle due to the wildfires, stands in Shining Bank, Alberta, on May 11.

BJ Fuchs, a farmer who has lost some land and had to move his cattle due to the wildfires, stands in Shining Bank, Alberta, on May 11.

Anne-Sophie Thill/AFP via Getty Images