The main factors causing environmental pollution included vehicles increase , diffuse pollution growth , imperfect urban basic facilities construction , disadvantageous effect of meteorological condition in winter and industrial pollution around et al 長治市環境空氣質量超過國家二級標準的主要影響因素為機動車輛增加、面源污染嚴重、城市基礎設施不完善、冬季氣象條件不利和周邊工業污染對城市的影響等諸方面。