Tourists visit a shop in the China Town of San Francisco, California, the United States, March 24, 2021. San Francisco Mayor London Breed on Tuesday announced that the city will resume most businesses and activities that are allowed by the state of California in the orange tier (the 2nd lowest) for counties with moderate COVID-19 transmission levels. (Xinhua/Wu Xiaoling)

Tourists visit the China Town of San Francisco, in California, the United States, March 24, 2021. San Francisco Mayor London Breed on Tuesday announced that the city will resume most businesses and activities that are allowed by the state of California in the orange tier (the 2nd lowest) for counties with moderate COVID-19 transmission levels. (Xinhua/Wu Xiaoling)

People walk on a street in San Francisco, California, the United States, March 24, 2021. San Francisco Mayor London Breed on Tuesday announced that the city will resume most businesses and activities that are allowed by the state of California in the orange tier (the 2nd lowest) for counties with moderate COVID-19 transmission levels. (Xinhua/Wu Xiaoling)

People walk across the street in front of a movie theater in San Francisco, California, the United States, March 24, 2021. San Francisco Mayor London Breed on Tuesday announced that the city will resume most businesses and activities that are allowed by the state of California in the orange tier (the 2nd lowest) for counties with moderate COVID-19 transmission levels. (Xinhua/Wu Xiaoling)

People walk across the street in San Francisco, California, the United States, March 24, 2021. San Francisco Mayor London Breed on Tuesday announced that the city will resume most businesses and activities that are allowed by the state of California in the orange tier (the 2nd lowest) for counties with moderate COVID-19 transmission levels. (Xinhua/Wu Xiaoling)

People walk past the windows of a department store in San Francisco, California, the United States, March 24, 2021. San Francisco Mayor London Breed on Tuesday announced that the city will resume most businesses and activities that are allowed by the state of California in the orange tier (the 2nd lowest) for counties with moderate COVID-19 transmission levels. (Xinhua/Wu Xiaoling)