摘要
为揭示2021年呼和浩特市城区环境空气中PM_(10)、PM_(2.5)质量浓度时空变化特征,以呼和浩特市8个国家环境空气质量监测站点实时监测数据为基础与人工监测数据对比分析,获得以下结果:(1)2021年呼和浩特市城区环境空气中PM_(10)、PM_(2.5)的小时平均质量浓度变化趋势为12:00和22:00时出现双峰值;PM_(10)、PM_(2.5)月平均质量浓度随时间变化趋势均表现为2021年3月份的月平均质量浓度最高、7月份的月平均质量浓度最低;(2)PM_(10)质量浓度变化特征为春季>冬季>秋季>夏季、而PM_(2.5)质量浓度变化特征为冬季>春季>秋季>夏季;PM_(2.5)年平均质量浓度未超标,PM_(10)年平均质量浓度为85μg/m3,超过国家二级标准;PM_(10)为呼和浩特市城区环境空气中的主要颗粒物污染物;(3)基于GIS的PM_(10)、PM_(2.5)质量浓度空间分布呈西高东低的分布特征,浓度变化趋势由东北向西南方向递增;(4)与人工监测数据相比,环境空气中颗粒物浓度较高时,自动监测数据普遍偏低。
To reveal the spatiotemporal variation of PM_(10)and PM_(2.5)concentrations in the urban ambient air of Hohhot in 2021,the real-time monitoring data from eight urban assessing stations of Hohhot and the monitoring data collected by manual methods were analyzed comparatively.The results indicated that(1)the hourly average concentrations of PM_(10)and PM_(2.5)in the urban ambient air of Hohhot in 2021 presented a bimodal distribution everyday which appeared at 12:00 and 22:00 respectively,the highest monthly average concentration appeared in March of the year and the lowest monthly average concentration appeared in July of the year;that(2)the seasonal change of PM_(10)concentration was in spring>winter>autumn>summer and the seasonal change of PM_(2.5)concentration was in winter>spring>autumn>summer,the annual average concentration of PM_(2.5)did not exceed the national standard,while the annual average concentration of PM_(10)was 85μg/m3,exceeding the national secondary standard at 0.21 times,which was the main particulate pollutant in the urban ambient air of Hohhot;that(3)the PM_(10)and PM_(2.5)concentrations based on GIS showed a spatial distribution of high in the west and low in the east and presented a trend of increase from northeast to southwest;that(4)the comparison between the automatic monitoring data from the urban assessing stations and manual methods monitoring data showed that the data from automatic monitoring tended to be lower than manual methods monitoring data when the concentration of particulate matter in the ambient air was high.
作者
丁艳旭
包海
高星星
DING Yanxu;Baohai;GAO Xingxing(College of Chemistry and Environment Science,Inner Mongolia Normal University,Hohhot 010022,China;Inner Mongolia Key Laboratory of Environmental Chemistry,Hohhot 010022,China)
出处
《内蒙古师范大学学报（自然科学汉文版）》
CAS
2023年第5期441-449,共9页
Journal of Inner Mongolia Normal University(Natural Science Edition)
基金
国家自然科学基金资助项目(22266024)
内蒙古自治区自然科学基金资助项目(2022MS020003)
内蒙古师范大学研究生创新基金资助项目(CXJJS21138)。
