New York City has topped the list of the worst air pollution in the world as smoke from a number of Canadian wildfires created a thick haze across the region’s skyline, triggering a wide discussion among netizens, with many expressing their concerns over the city’s air quality.
With large swaths of the U.S. shrouded in smoke from Canadian wildfires, now's a good time to review the basics of the Environmental Protection Agency's Air Quality Index.
Air quality alerts remained in effect in the United States in the Northeast and Midwest and might extend into Friday, when the smoke is expected to disperse.