Residents of the city of Zhangjiakou, Hebei province, now breath the best air, while those in Tangshan get the worst, as of March, according to environmental protection officials, whose monthly report on air quality in 74 cities was released on April 19. Tangshan, a major industrial city, shoed the worst air qualit, the Environment Protection Ministry has confirmed.

Five other cities in the province - Shijiazhuang, Xingtai, Baoding, Handan and Langfang, were among the worst 10, while Zhangjiakou had the best air quality.