People wearing masks are seen on a street in Brussels, Belgium, on Aug. 5, 2020. The city of Brussels recently extended the requirement to wear face masks in its territory to include all busy streets and pedestrian zones. (Xinhua/Zheng Huansong)

A man wearing a mask walks on a street in Brussels, Belgium, on Aug. 5, 2020. The city of Brussels recently extended the requirement to wear face masks in its territory to include all busy streets and pedestrian zones. (Xinhua/Zheng Huansong)

A sign reminding people to wear masks is seen on a street in Brussels, Belgium, on Aug. 5, 2020. The city of Brussels recently extended the requirement to wear face masks in its territory to include all busy streets and pedestrian zones. (Xinhua/Zheng Huansong)

People wearing masks are seen on a street in Brussels, Belgium, on Aug. 5, 2020. The city of Brussels recently extended the requirement to wear face masks in its territory to include all busy streets and pedestrian zones. (Xinhua/Zheng Huansong)

People wearing masks are seen on a street in Brussels, Belgium, on Aug. 5, 2020. The city of Brussels recently extended the requirement to wear face masks in its territory to include all busy streets and pedestrian zones. (Xinhua/Zheng Huansong)

People walk past a sign reminding people to wear masks in Brussels, Belgium, on Aug. 5, 2020. The city of Brussels recently extended the requirement to wear face masks in its territory to include all busy streets and pedestrian zones. (Xinhua/Zheng Huansong)

People walk past a sign reminding people to wear masks in Brussels, Belgium, on Aug. 5, 2020. The city of Brussels recently extended the requirement to wear face masks in its territory to include all busy streets and pedestrian zones. (Xinhua/Zheng Huansong)

People wearing masks are seen on a street in Brussels, Belgium, on Aug. 5, 2020. The city of Brussels recently extended the requirement to wear face masks in its territory to include all busy streets and pedestrian zones. (Xinhua/Zheng Huansong)