See it: Smoke From Canadian Wildfires Blankets US Cities

Smoke from wildfires in Canada covered New York City and other parts of the northeast with a thick yellow haze on Wednesday.

As New York faced its worst air quality since the 1960s, many likened the strange yellow appearance of the air pollution to Mars or a scene from an apocalyptic movie.

Across the northeast, flights were grounded and officials warned residents to stay inside.

"We recommend all New Yorkers limit outdoor activity to the greatest extent possible," said New York City Mayor Eric Adams, in a statement.

Smoke From Canadian Wildfires Blows South Creating Hazy Conditions On Large Swath Of Eastern U.S. — Smoky haze from wildfires in Canada blankets a neighborhood in the Bronx on June 6, 2023.David Dee Delgado/Getty

A person walks with a strolled in front of the hazy New York skyline, obscured by wildfire smoke. — A person walks with a stroller in a park in Weehawken, New Jersey, June 7, 2023.Eduardo Munoz Alvarez/Getty Images

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Lower Manhattan air quality — The World Trade Center appears blanketed in orange smoke on June 7, 2023.New York Metro Weather/Twitter

The air quality outside the National Weather Service in Binghamton — A parking lot outside the National Weather Service's outpost in Binghamton, NY takes on an orange glow on June 7, 2023.NWS Binghamton/Twitter

Lower Manhattan skyline from Brooklyn Heights promenade. 3 pm — The lower Manhattan skyline as seen from from Brooklyn Heights promenade appear dark at 3 p.m. on June 7, 2023.Courtesy of Gabriela Sloane

People look out over Manhattan enveloped in a dense haze caused by wildfires in Canada on June 06, 2023 in New York City. — People look out over Manhattan enveloped in a dense haze on June 06, 2023 in New York City.Spencer Platt/Getty Images

Lower Manhattan skyline is shrouded in an orange-yellow haze late Wednesday afternoon, June 7, 2023. Courtesy of Lucia Sloane

Syracuse is blanketed in a thick layer of smoke from Canadian wildfires. — Syracuse is blanketed in a thick layer of smoke from the Canadian wildfires.NewsChannel 9 Syracuse

People walk along the Brooklyn Promenade as a reddish haze enshrouds the Manhattan skyline as a result of Canadian wildfires on June 06, 2023 in New York City. — People walk along the Brooklyn Promenade as a reddish haze enshrouds the Manhattan skyline onJune 06, 2023.Spencer Platt/Getty

See it: Smoke From Canadian Wildfires Blankets US Cities

Photographs detail the odd yellow-orange sky phenomenon in places like New York that has prompted comparisons to Mars