摘要:
根据雅安市4个空气自动站监测数据, 按照《环境空气质量标准》 (GB3095-2012) 中的二级标准, 采用综合污染指数法分析了雅安市2009~2013年环境空气质量时空动态变化趋势及其影响因素。结果表明:从年际变化看, PM10和SO2浓度呈下降趋势, NO2浓度在2013年略有上升;年内变化显示, 各污染物浓度季节变化明显, 冬季污染最严重, 污染程度由高到低的顺序为冬季、秋季、春季、夏季;空间变化显示, SO2浓度存在一定的空间差异性, 各监测点位SO2浓度随年限均呈下降趋势。NO2和PM10浓度空间分布差异明显。雅安空气环境综合污染指数呈下降趋势, 空气污染程度得到了明显缓解, 空气质量逐渐改善, 并在上述研究基础上, 提出了环境空气质量的改善途径。
Abstract:
Based on the data from 4 air automatic monitoring sites in Ya'an City, according to the second level in the Ambient Air Quality Standards (GB3095-2012) , comprehensive pollution index method was used to analyze the temporal-spatial dynamic variation trend of ambient air quality in Ya'an City from 2009 to 2013 and related influential factors. The results showed that the concentration of PM10 and SO2 decreased year by year, but the concentration of NO2 increased slightly in 2013. Concentration of each pollutant appeared obvious seasonal variation within a year. Pollution was the most serious in winter. The seasons with pollution levels in a descending order are winter, autumn, spring and summer. With regard to the spatial variation, concentration of SO2 showed spatially different to a certain degree and decreased at each monitoring site with years passing by. Spatial distribution of the concentrations of NO2 and PM10 showed different significantly. The comprehensive ambient air pollution index for Ya'an City appeared in a downtrend. Air pollution was mitigated and air quality was improved gradually. On the basis of the above study, improvement measures for ambient air quality were put forewords.
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