A view of Qianan in Hebei province in December last year. Qianan, with many smoking factories and three-hour drive from China's capital city Beijing, is regarded as one of the air pollutant sources of the capital. Photo: Simon Song
A view of Qianan in Hebei province in December last year. Qianan, with many smoking factories and three-hour drive from China's capital city Beijing, is regarded as one of the air pollutant sources of the capital. Photo: Simon Song