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EXPLAINER: How China got blue skies in time for Olympics

Jia Pei, 30, speaks during an interview about air quality next to the Drum Tower in Beijing on Monday, Feb. 7, 2021. He said the air in Beijing used to feel like "inhaling dust" because of industrial pollution but that "it's a lot better now." (AP Photo/Sam McNeil) Mathilde Gremaud, of Switzerland, trains ahead of the women's freestyle skiing Big Air qualification round of the 2022 Winter Olympics, Monday, Feb. 7, 2022, in Beijing. (AP Photo/Matt Slocum) FILE - Canada's Mark McMorris competes during the men's slopestyle qualifying at the 2022 Winter Olympics, Feb. 6, 2022, in Zhangjiakou, China. Beijing’s air still has a long way to go, but is measurably better than past years. (AP Photo/Francisco Seco, File) FILE - Canada's Darcy Sharpe competes during the men's slopestyle qualifying at the 2022 Winter Olympics, Feb. 6, 2022, in Zhangjiakou, China. Beijing’s air still has a long way to go, but is measurably better than past years. (AP Photo/Gregory Bull, File) FILE - Cyclists ride past a traditional Chinese gateway during a day murky from fog and pollution in Beijing, on Oct. 26, 2007, top, and the same location on Feb. 5, 2022. Beijing’s air still has a long way to go, but is measurably better than past years. (AP Photo/Ng Han Guan, File)