PM_(2.5)污染特征及污染源模拟研究

Research on Pollution Characteristics of PM_(2.5) and Pollutant Source Simulation

为了解深圳市坪山新区环境空气质量现状，研究运用坪山新区PM2.5，浓度数据，分析该区PM25的污染特征及气象条件对其的影响，坪山新区PM2.5浓度呈现了明显的季节变化、月变化特征，表现为秋冬季高、夏季低、春季居中的特点；PM2.5浓度最高出现在12月，最低出现在7月。该区PM。浓度日间变化呈双峰分布，7：00～9：00出现短期高峰，夜间21：00～次日4：00出现长期高峰。坪山新区PM2.5超标情况多出现在秋冬季及初春。在超标日期里，区域一般温度较低、风速较小，相对湿度也较低。污染源分析模型结果表明，坪山新区PM2.5的排放强度高值区主要集中在北部和西部，南部和东部排放强度稍低。由此可见，坪山新区大气环境亟待提升，需要针对区域内大气颗粒物污染进行有效防治。

In order to recognize the current air quality in Pingshan New District（ PS）, Shenzhen, a study of PM2.5 concentration in the area was investigated to analyse the PM2.5 pollution characteristics and the effects of meteorological condition on it. The PM2.5 concentration in PS has apparent season variation and monthly variation. The PM2.5 concentration was high in autumn and winter, low in summer and moderate in spring. Normally, the PM2.5 concentration is high in December and low in July. The PM2.5 diurnal concentration in PS was in the bimodal form, that is to say, short -term peak in 7：00 -9：00 am and long -term peak in 9：00 pm - 4：00 am. The situation of PM2.5 concentration exceeding the standardoften happened in autumn, winter and early spring. At that time, the interested district often has low temperature, light wind speed and low relative humidity. The results of pollutant source identity model showed that the PM2.5 emission identities in PS were high in north and west area and relatively low in south and east area. It could he concluded that the atmospheric environmental in PS must he urgently improved and corresponding effective strategies should be taken.