Is smog serious in Tianjin in winter?

Serious. According to inquiries from the Tianjin Municipal Ecological Environment Bureau, Tianjin’s air pollution is relatively serious, and there are long periods of haze throughout the year, especially in winter. Tianjin is a provincial-level administrative region, a municipality directly under the Central Government, a national central city, a megacity of the People's Republic of China, and the economic center of the Bohai Rim region approved by the State Council.