Air Quality This Week Gives U.S. a Glimpse of the World's Air Pollution
By Mike Ives, Muktita Suhartono & Jin Yu
NYC's air quality ranked worst of any major city on Wednesday. With climate change, will it happen again?
By Rebecca Sohn
Just How Bad Was the Pollution in New York?
By Aatish Bhatia, Margot Sanger-Katz & Josh Katz