【摘要】 灰霾是一种气溶胶和气体污染造成的城市和区域性污染现象.对视觉空气质量以及人体健康造成极大影响.本研究针对灰霾引起的能见度下降的原因、机理等进行阐述,并对能见度的测量方法、灰霾国内外研究方向及灰霾治理措施进行了介绍,最后根据已有资料对北京市2001年能见度进行初步化学核算,得出北京市春季能见度最好(核算结果大于11km),夏季最差(核算结果不足9km)的结论,在理论上与实际监测值相符.更多还原

【Abstract】 With the development of civilization,visibility in most of the urban areas comes to be a big problem.The reason and mechanism that attribute to haze are discussed in this paper.The latest policy in the US is introduced as well.The main factors which cause haze can be divided into two aspects:environmental pollution factor and meteorological factor.Visibility can be calculated from measurements of atmospheric chemical components.The visibility of Beijing in 2001 is calculated as an example.Judging from the calculation,spring is the clearest season of the whole year(above 11 km according to the calculated results),while summer is the poorest(no more than 9 km),which agrees with the real monitoring record.更多还原