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目的分析2007—2011年江苏省南京市某区大气中PM2.5的污染现状,评价其变化趋势,为进一步研究PM2.5对人群健康的影响提供依据。方法以南京市某区2007—2011年间的大气补充监测数据为依据,选择PM2.5指标作为评价因子,运用Spearman秩相关系数预测其发展趋势。结果该区PM2.5月均浓度变化接近于U型,季节性变化较为明显,5年间年均浓度变化呈下降趋势(P<0.05)。结论该区PM2.5污染的控制和治理取得一定成效,但整体污染浓度仍较高,需进一步调整工业布局,加快地方性法规、规章和规范性文件的制定步伐。
Objective To analyze the pollution status of PM2.5 in the atmosphere of a district in Nanjing City of Jiangsu Province from 2007 to 2011 and evaluate the trend of the changes in PM2.5 so as to provide evidences for further studying the impact of PM2.5 on the health of the population. Methods Based on the atmospheric supplemental monitoring data from 2007 to 2011 in a district of Nanjing City, the PM2.5 index was selected as the evaluation factor and the Spearman rank correlation coefficient was used to predict its development trend. Results The annual PM2.5 PM2 concentration was nearly U-shaped in this area, and the seasonal variation was more obvious. The annual average concentration showed a downward trend in 5 years (P <0.05). Conclusion The control and treatment of PM2.5 pollution in this area has achieved some success. However, the overall pollution concentration is still high, and the industrial layout needs to be further adjusted to speed up the formulation of local laws, regulations and regulatory documents.