A woman wearing a face mask walks on a street in Chicago, Illinois, the United States, on May 1, 2020. The modified stay-at-home order in Illinois, effective from May 1, made mandatory face-covering in a public place where they cannot maintain a six-foot social distance for anyone over the age of two. (Photo by Joel Lerner/Xinhua)

People wearing face masks walk on a street in Chicago, Illinois, the United States, on May 1, 2020. The modified stay-at-home order in Illinois, effective from May 1, made mandatory face-covering in a public place where they cannot maintain a six-foot social distance for anyone over the age of two. (Photo by Joel Lerner/Xinhua)

Photo taken on May 1, 2020 shows a lion statue with a mask in front of the Art Institute of Chicago in Chicago, Illinois, the United States. The modified stay-at-home order in Illinois, effective from May 1, made mandatory face-covering in a public place where they cannot maintain a six-foot social distance for anyone over the age of two. (Photo by Joel Lerner/Xinhua)

Photo taken on May 1, 2020 shows a statue of Dorothy and Toto with a mask in Chicago, Illinois, the United States. The modified stay-at-home order in Illinois, effective from May 1, made mandatory face-covering in a public place where they cannot maintain a six-foot social distance for anyone over the age of two. (Photo by Joel Lerner/Xinhua)

Photo taken on May 1, 2020 shows a statue of Dorothy and Toto with a mask in Chicago, Illinois, the United States. The modified stay-at-home order in Illinois, effective from May 1, made mandatory face-covering in a public place where they cannot maintain a six-foot social distance for anyone over the age of two. (Photo by Joel Lerner/Xinhua)

Photo taken on May 1, 2020 shows a lion statue with a mask in front of the Art Institute of Chicago in Chicago, Illinois, the United States. The modified stay-at-home order in Illinois, effective from May 1, made mandatory face-covering in a public place where they cannot maintain a six-foot social distance for anyone over the age of two. (Photo by Joel Lerner/Xinhua)

People wearing face masks walk on a street in Chicago, Illinois, the United States, on May 1, 2020. The modified stay-at-home order in Illinois, effective from May 1, made mandatory face-covering in a public place where they cannot maintain a six-foot social distance for anyone over the age of two. (Photo by Joel Lerner/Xinhua)

Photo taken on May 1, 2020 shows the Picasso statue with a mask at Daley Plaza in Chicago, Illinois, the United States. The modified stay-at-home order in Illinois, effective from May 1, made mandatory face-covering in a public place where they cannot maintain a six-foot social distance for anyone over the age of two. (Photo by Joel Lerner/Xinhua)