Millions of people in New York City and other northeast locations scrambled to keep themselves free of the smoky air throughout the day and evening.
The city’s skyline was barely visible for most parts of the day and the smell of the smoke was strong as commuters hit the evening rush.
Large cities with the lowest air quality include New York City, Albany and Cincinnati, a map by Airnow, a website that publishes air quality data, shows.
Another large and dense plume of smoke will be moving down across parts of the Northeast on Wednesday, according to forecasters.
That batch of very dense smoke will push down across the Northeast throughout the day on Wednesday, giving some relief to New England and the Midwest.
-ABC News’ Julia Jacobo, Max Golembo and Daniel Peck
