Police officers check cargo trains amid sandstorm at a border checkpoint in Erenhot, Inner Mongolia Autonomous Region, China March 21, 2023. cnsphoto via REUTERS ATTENTION EDITORS - THIS IMAGE WAS PROVIDED BY A THIRD PARTY. CHINA OUT. TPX IMAGES OF THE DAY

Women pose near cherry blossom trees amid a sandstorm, at a park in Beijing, China March 22, 2023. REUTERS/Tingshu Wang

A woman walks on a bridge amid a sandstorm, at a park in Beijing, China March 22, 2023. REUTERS/Tingshu Wang

A general view of buildings shrouded in smog amid a sandstorm, at Beijing's Central Business District (CBD) in Beijing, China March 22, 2023. REUTERS/Tingshu Wang TPX IMAGES OF THE DAY

People walk amid a sandstorm at a park in Beijing, China March 22, 2023. REUTERS/Tingshu Wang

A general view of buildings shrouded in smog amid a sandstorm, at Beijing's Central Business District (CBD) in Beijing, China March 22, 2023. REUTERS/Tingshu Wang