This photo shows a street amid fog in Riga, Latvia, Oct. 8, 2024. (Photo: Xinhua)

This photo shows a city channel amid fog in Riga, Latvia, Oct. 8, 2024. (Photo: Xinhua)

People walk at a square amid fog in Riga, Latvia, Oct. 8, 2024. (Photo: Xinhua)

People walk at a park amid fog in Riga, Latvia, Oct. 8, 2024. (Photo: Xinhua)