Spatial and temporal distribution of NO2 during 2013~2014 in Beijing
CHENG Nian-liang1,2,3, LI Yun-ting1, CHEN Tian1, ZHANG Da-wei4, DONG Xin1, WANG Xin1, HUAN Ning1, LIU Bao-xian1, YAN He1, MENG Fan2,3
1. Beijing Key Laboratory of Airborne Particulate Matter Monitoring Technology, Beijing Municipal Environmental Monitoring Center, Beijing 100048, China;
2. College of Water Sciences, Beijing Normal University, Beijing 100875, China;
3. Chinese Research Academy of Environmental Sciences, Beijing 100012, China;
4. Beijing Environmental Protection Bureau, Beijing 100048, China
The Spatial and temporal distribution characteristics of NO2 during 2013~2014 were analyzed based on the NO2 monitoring data released by Beijing Municipal Environmental Monitoring Center. The analytical results showed that the annual average concentration of NO2 in Beijing was 56.7μg/m3 in 2014 and increased 1.3% compared to that of NO2 (56μg/m3) in 2013. The monthly average concentration of NO2 changed in a wave-shape curve and the diurnal variation of NO2 showed bimodal distribution. The annual average concentration of NO2 was lower in the northern and western regions while higher in the six city area and southern area; NO2 and PM2.5, CO, NO showed a positive correlation while NO2 and OX, O3 had no significant correlation relationship. Calculated photolysis rate of NO2 in the whole year and heavy pollution days was 0.105/min, 0.026/min, respectively. The values of NOR was 0.142±0.061, 0.190±0.036 in the whole year and heavy pollution days, respectively. High concentration of NO2 was conducive to the formation of O3 and also played a promoting role of heavy air pollution formation. Correlation coefficient between vehicle number and the annuanl concentration of NO2 during 2000~2014 in Beijing was -0.84 and the NOx emissions of vehicle had a significant effect on the change of the annual concentration of NO2 in the area of Beijing city.
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