The mental image many people have of the Los Angeles skyline is one obscured by smog, with thick air pollution hanging over its downtown buildings.
원문출처 : https://www.cnn.com/2020/04/07/us/los-angeles-pollution-clean-air-coronavirus-trnd/index.html
원문출처 : https://www.cnn.com/2020/04/07/us/los-angeles-pollution-clean-air-coronavirus-trnd/index.html