People cross the street shrouded by pollution haze as smog covers Sarajevo, Bosnia, Thursday, Dec. 19, 2024. (AP Photo/Armin Durgut)

A woman wears a face mask shrouded by pollution haze as smog covers Sarajevo, Bosnia, Thursday, Dec. 19, 2024. (AP Photo/Armin Durgut)

Avaz Twist Tower building, 172 meters high, peaks through a dense layer of fog and smog in Sarajevo, Bosnia, Thursday, Dec. 19, 2024. (AP Photo/Armin Durgut)

General view of Sarajevo and TV Tower as a dense layer of fog and smog blankets Sarajevo, Bosnia, Thursday, Dec. 19, 2024. (AP Photo/Armin Durgut)

Avaz Twist Tower building, 172 meters high, peaks through a dense layer of fog and smog in Sarajevo, Bosnia, Thursday, Dec. 19, 2024. (AP Photo/Armin Durgut)

Avaz Twist Tower building, 172 meters high, peaks through a dense layer of fog and smog in Sarajevo, Bosnia, Thursday, Dec. 19, 2024. (AP Photo/Armin Durgut)

A man walks a dog shrouded by pollution haze as smog covers Sarajevo, Bosnia, Thursday, Dec. 19, 2024. (AP Photo/Armin Durgut)

People cross a bridge shrouded by pollution haze as smog covers Sarajevo, Bosnia, Thursday, Dec. 19, 2024. (AP Photo/Armin Durgut)

A man crosses a bridge shrouded by pollution haze as smog covers Sarajevo, Bosnia, Thursday, Dec. 19, 2024. (AP Photo/Armin Durgut)

A woman wears a face mask shrouded by pollution haze as smog covers Sarajevo, Bosnia, Thursday, Dec. 19, 2024. (AP Photo/Armin Durgut)