宝鸡市可吸入颗粒物24h浓度变化特征分析

Analysis of concentration variation characteristics of inhalable particulate matter for 24 hours in Baoji City

目的分析宝鸡市区空气中可吸入颗粒物（PM10）24 h浓度变化特征,总结其规律性,以便百姓参考。方法利用2003～2007年大气自动监测数据,结合气象资料,对宝鸡市区多年监测结果进行统计分析,每年分为采暖期和非采暖期2个阶段分别进行分析。结果宝鸡市区PM10平均小时浓度值的日变化特征为12月份9点浓度最高,可以达到0.29 mg/m^3,每年的3月份凌晨2点其浓度最低值,为0.03 mg/m^3,每年的元月到3月中旬和11月中旬到年底,宝鸡市区PM10日平均小时浓度变化幅度较大,在6：00～11：00和17：00～23：00各出现一次峰值。3月份PM10的最小值与最大值相差0.20mg/m^3,2月份PM10的最小值与最大值相差0.12 mg/m^3;非采暖期PM10浓度起伏较小,另外全天PM10浓度变化与气象条件和人为因素密切相关。结论全年各月PM1024 h内的浓度变化规律明显,对宝鸡市居民合理安排出行、PM10控制和治理具有参考价值。

Aim To analyze the characteristics of PM10 concentration in air for 24 hours in Baoji City, Shaanxi, China and to summarize the rules for helping people＇s life. Methods The atmospheric automatic monitoring data and the weather data of Baoji City are used to analyze the PM10 changes per hour from 2003 to 2007, and a year is divided into heating period and non-heating period. The two periods are researched respectively. Results The change characteristics of PM10 concentration for 24 hours in Baoji City： the highest PM10 concentration （0.29 mg/m^3） appear at 9：00 in December and the lowest （0.03 mg/m^3） at 2：00 in March. During the heating period PM10 concentration variation has been great and the peak values appear in 6 ： 00 ～ 11 ： 00 and 17 ： 00 ～ 23 ： 00 every day. The maximum difference （0.20 mg/m^3） of PM10 hours concentration appear in March, the minimum difference （0.12 mg/m^3） in February. But during the non-heating period, PM10 concentration variation is slight and is related to weather condition and man-made factors. Conclusion The rules of PM10 concentration variation in 24 hours every day in all year is obvious, and it provide certain references both for the PM10 concentration integrated control and rational arrangements of residents going out in Baoji City.