Abstract:NOx, CO, SO2, O3, PM2.5, PM10, along with meteorological factors, were observed in Tianjin Binhai New Area, a coastal site southeast of Beijing and Tianjin, in order to understand atmospheric pollution levels and their sources in that region. From September 2009 to February 2010 the daily average maximum (mean ±standard deviation) concentrations of NOx, CO, SO2, O3, PM2.5, PM10 were 300.7(65.4±52.9)×10-9,7.278(1.324±1.169)×10-6,53(13±12)×10-9,95(28±21)×10-9 (maximum hourly averaged O3)(V/V) and 287.4(62.3±53.6)μg/m3, 1421.4(161.9±136) μg/m3, respectively; the levels of NOx and SO2 were lower and the level of O3 and PM10 were higher in autumn than those in winter; the daily average concentration of CO and PM10 exceeded the National Ambient Air Quality Standard Ⅱ for 2% and 38%, and PM2.5 exceeded the WHO Standard for 31%. The average diurnal variations of NOx and CO were similar, peaking in the early morning and night, while SO2 peaking at noon, O3 peaking in the afternoon with larger diurnal amplitude in autumn than that in winter; PM10 occurred maximum in the early morning and night during autumn, while earlier 2~3 hours than that in winter. Meteorological parameters could explain from 49% to 74% of the day-to-day variations of pollutant concentrations, except PM10 during winter. The findings suggested that the atmospheric pollution in Binhai New Area was related to local emission and regional transport, that was to say, southwest wind was firstly favorable for accumulating pollutants and northeast wind secondly, while east and southeast winds were helpful for dispersing pollutants; aiming for different pollutants, NOx was controlled by local emission, SO2 by regional transport, CO and PM2.5 by both local and regional influence, PM10 by local emission in autumn and both local and regional influence in winter.
王莉莉, 王跃思, 吉东生, 辛金元, 胡波, 王万筠. 天津滨海新区秋冬季大气污染特征分析[J]. 中国环境科学, 2011, 31(7): 1077-1086.
WANG Li-Li, WANG Yue-Si, JI Dong-Sheng, XIN Jin-Yuan, HU Bo, WANG Wan-Jun. Characteristics of atmospheric pollutants in Tianjin Binhai New Area during autumn and winter. CHINA ENVIRONMENTAL SCIENCECE, 2011, 31(7): 1077-1086.