He Hong, Wang Yuesi, Ma Qingxin, Ma Jinzhu, Chu Biwu, Ji Dongsheng, Tang Guiqian, Liu Chang, Zhang Hongxing, Hao Jiming
Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry (LAPC), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China.
Sci Rep. 2014 Feb 25;4:4172. doi: 10.1038/srep04172.
Haze in China has been increasing in frequency of occurrence as well as the area of the affected region. Here, we report on a new mechanism of haze formation, in which coexistence with NOx can reduce the environmental capacity for SO2, leading to rapid conversion of SO2 to sulfate because NO2 and SO2 have a synergistic effect when they react on the surface of mineral dust. Monitoring data from five severe haze episodes in January of 2013 in the Beijing-Tianjin-Hebei regions agreed very well with the laboratory simulation. The combined air pollution of motor vehicle exhaust and coal-fired flue gases greatly reduced the atmospheric environmental capacity for SO2, and the formation of sulfate was found to be a main reason for the growth of fine particles, which led to the occurrence of haze. These results indicate that the impact of motor vehicle exhaust on the atmospheric environment might be underestimated.
中国雾霾出现的频率以及受影响区域的面积一直在增加。在此，我们报告一种新的雾霾形成机制，其中与氮氧化物共存会降低环境对二氧化硫的容纳能力，导致二氧化硫迅速转化为硫酸盐，因为二氧化氮和二氧化硫在矿物粉尘表面发生反应时具有协同效应。2013年1月京津冀地区五次严重雾霾事件的监测数据与实验室模拟结果非常吻合。机动车尾气和燃煤烟气的混合空气污染极大地降低了大气对二氧化硫的环境容纳能力，并且发现硫酸盐的形成是细颗粒物增长的主要原因，这导致了雾霾的出现。这些结果表明机动车尾气对大气环境的影响可能被低估了。
