People visit the Namsan Park amid smog in Seoul, South Korea, March 16, 2021. (Photo by Seo Yu-Seok/Xinhua)
Photo taken on March 16, 2021 shows the smog-shrouded downtown area of Seoul, South Korea. (Photo by Seo Yu-Seok/Xinhua)
Photo taken on March 16, 2021 shows the smog-shrouded downtown area of Seoul, South Korea. (Photo by Seo Yu-Seok/Xinhua)