不同场所室内外PM_(2.5)浓度水平及其气象特征研究

Research on level of PM_(2.5) fine particles concentration and meteorological characteristics in different places

目的掌握居民区外环境空气中PM_(2.5)的暴露水平及存在的健康危害因素,并开展危害因素分析。方法设置4个不同场所环境监测点,三个室内(居民住户、学校、办公场所)及一个室外对照监测点。每日20h不间断采样,连续监测一年,测定PM_(2.5)、PM_(10)浓度水平,同时收集气象数据。结果三个室内监测点PM_(2.5)浓度均随着室外PM_(10)浓度和室外PM_(2.5)浓度的增加而增加,呈正相关。温度等气象条件对室外PM_(2.5)浓度有一定影响,风速与室外PM_(2.5)浓度成正相关。PM_(2.5)和PM10浓度水平在1-2月和9-10月出现高值,可能与气象因素有关。结论密云区大气细细颗粒物和可吸入颗粒物的水平相对较高,室外高于室内。本地区存在颗粒物污染超标情况,应引起重视。

Objective To analyze the health risk factors that the exposure level of PM2.5 in the air of the outdoor environment of the residential area. Methods 4 different environmental monitoring points were set up, respectively： three indoor points （residents,school,office）, and one outdoor control monitoring point. PM2.5 and PM10 mass concentration were determined respectively by continuous sampling for 20h everyday and continuous monitoring for one year. And the meteorological data were collected at the same time. Results The results showed that the concentration of PM2.5 in three indoor monitoring points increased with the increase of the concentration of outdoor PM10 and PM2.5, and there was a correlation between fine particulate pollution indoor and outdoor air pollution. The weather conditions such as temperature had a certain effect on the outdom＂ PM2.5concentration from single factor analysis. There were positive correlations between the wind speed and the outdoor PM2.5 concentration. The high value of PM2.5 and PM10 mass concentration in January to February and September to October, it might be related to meteorological conditions. Conclusion The level of air fine particles and PM in Miyun district is relatively high,the indoor is higher than the outdoor.There exists excessive state of paniculate pollution in Miyun district, which should be paid attention.