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What other cities in China have no smog?

The smog is in the Beijing-Tianjin-Hebei and Luxi areas, mainly because there are many pollutants emitted by industries in this area. In the northeast, because of the cold winter, the heating industry also emits a large number of tiny particles, while in Shanghai and Hangzhou, the wind direction and urban effects are obvious. There is little smog in the northwest and southwest. . . My home is in Yantai, and there is no smog.