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 长治市环境空气质量超过国家二级标准的主要影响因素为机动车辆增加、面源污染严重、城市基础设施不完善、冬季气象条件不利和周边工业污染对城市的影响等诸方面。