A person walks with a broom and dustpan during morning rush hour as Beijing, China, is hit by a sandstorm, March 15, 2021. REUTERS/Thomas Peter

A sweeper walks with a broom along a road during morning rush hour as Beijing, China, is hit by a sandstorm, March 15, 2021. REUTERS/Thomas Peter

People go about their day during morning rush hour as Beijing, China, is hit by a sandstorm, March 15, 2021. REUTERS/Thomas Peter

Nurses go about their day during morning rush hour as Beijing, China, is hit by a sandstorm, March 15, 2021. REUTERS/Thomas Peter

A woman walks past Drum Tower during morning rush hour as Beijing, China, is hit by a sandstorm, March 15, 2021. REUTERS/Thomas Peter

A visitor wearing a face mask stands on barricades at a peak overlooking the Forbidden City at Jingshan Park, as the city is hit by sandstorm, in Beijing, China March 15, 2021. REUTERS/Tingshu Wang

A visitor wearing a face mask looks on from behind barricades at a peak overlooking the Forbidden City at Jingshan Park, as birds fly past while the city is hit by a sandstorm, in Beijing, China March 15, 2021. REUTERS/Tingshu Wang

A couple react during their wedding photoshoot near the Forbidden City, as the city is hit by sandstorm, in Beijing, China March 15, 2021. REUTERS/Tingshu Wang

A couple poses during their wedding photoshoot while others take pictures of the scenery near the Forbidden City, as the city is hit by sandstorm, in Beijing, China March 15, 2021. REUTERS/Tingshu Wang

A woman crosses a road with a head covering in Beijing, China, as the city is shrouded in haze after a sandstorm, March 15, 2021. REUTERS/Thomas Peter

A man walks past buildings shrouded in haze after a sandstorm in the Central Business District of Beijing, China March 15, 2021. REUTERS/Thomas Peter

People walk in the Central Business District of Beijing, China, as the city skyline is shrouded in haze after a sandstorm, March 15, 2021. REUTERS/Thomas Peter