2001年～2008年及奥运会期间天津市大气污染特征分析

根据天津市大气质量监测数据,对2001年～2008年及奥运会期间天津市大气污染特征和主要大气污染物的变化规律进行了分析。结果表明,2001年～2008年天津市的PM10、SO2和NO2污染总体呈下降趋势,但质量浓度仍相对较高。2008年8月奥运会期间天津市PM10和SO2质量浓度达到国家空气质量二级标准,NO2质量浓度达到国家空气质量一级标准,空气质量良好。天津市PM10污染相对稳定,SO2和NO2的污染分布呈现明显的季节性,时间上表现为冬强夏弱。气象条件对污染物浓度影响明显,沙尘、大雾等天气可使污染物浓度急剧升高。

Characteristics of Atmospheric Pollution during 2001~2008 and Olympic Games in Tianjin

Based on the air pollution data of Tianjin, the characteristics of atmospheric pollution during 2001~2008 and Olympic Games in Tianjin were analyzed. The results indicate that the concentrations of PM₁₀, SO₂ and NO₂ were decreased during 2001~2008. However, the concentrations of the three pollutants were relatively high. The annual average concentration of PM₁₀ and SO₂ met the second level of the national ambient air quality standard (NAAQS) during Olympic Games, and the concentration of NO₂ met the first level of NAAQS. The air quality was good during Olympic Games. Air pollution was severer in winter and milder in summer. The pollution of PM₁₀ was relatively steady, while both SO₂ and NO₂ presented obvious seasonal change. The meteorological conditions had a vital influence on the concentration of pollutants. Heavy dust and thick fog could dramatically increase the pollutant concentration.