CNN —A string of sports games and practices have been postponed as smoke from Canadian wildfires continues to choke the Midwest, Northeast and Southeast parts of the United States. Around 75 million people are under air quality alerts as wildfire smoke shrouds major US cities, with Major League Baseball (MLB), the Women’s National Basketball Association (WNBA) and the National Women’s Soccer League (NWSL) forced to postpone games due to concerns over dangerous air quality. Zack Wheeler of the Philadelphia Phillies warms up at Citizens Bank Park on Wednesday. Following consultation with the NWSL Medical and Operations staff, it was determined that the match could not be safely conducted based on the projected air quality index,” the NWSL said in a statement. Smoke from Canada’s fires has periodically affected the Northeast and Mid-Atlantic for more than a week, raising concerns over the harms of persistent poor air quality.

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Persons: Zack Wheeler, Mitchell Leff Organizations: CNN, Major League Baseball, National Basketball Association, National Women’s Soccer League, MLB, Detroit Tigers, Philadelphia Phillies, Citizens Bank, Chicago White Sox, New York Yankees, Yankee, WNBA, New York Liberty, Minnesota Lynx, New York Racing Association, NWSL, Operations, Phillies, Tigers, Yankees, White Sox, Belmont Locations: Northeast, United States, Belmont, New York, New Jersey, Harrison, Canada, Alberta, Elmont , New York