共查询到17条相似文献,搜索用时 203 毫秒
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指出了空气颗粒物污染不仅能使大气能见度降低,而且对人体健康造成危害。通过对贵阳市2个高层建筑可吸入颗粒物浓度的监测,对贵阳市冬季高层建筑可吸入颗粒物的污染水平和污染特征进行了研究。结果表明:城市高层建筑面临的颗粒物污染垂直分布是比较复杂的,较大颗粒的质量浓度底层要大于上层。对于同一个高层建筑,在不同楼层,PM2.5/PM10的比值变化幅度不大。大气中PM2.5和PM10没有明显的相关性,这主要和污染源分布以及天气条件有关。 相似文献
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指出了SO2、NO2、PM10和O3是大气的主要污染因子,大气中的SO2和NO2是形成酸雨的污染物质,PM10和O3浓度过高会对人体健康产生危害。针对大气中SO2、NO2、PM10和O3等污染因子的浓度变化规律,分析了2011年8月至12月南昌市空气质量的变化规律,探讨了其市区大气环境质量现状,大气污染特征及变化趋势。 相似文献
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石门国家森林公园空气颗粒物动态变化及评价 总被引:1,自引:0,他引:1
为揭示斑块型城市森林公园空气颗粒物浓度的时空变化规律,于2018年旱季和2019年雨季,通过长期连续固定监测方法,对石门国家森林公园花海、湖心岛、竹林、国际森林浴场4种生境颗粒物进行了监测和评价。结果表明,空气颗粒物各项指标均为旱季雨季,TSP、PM10平均浓度在各监测点排序为花海竹林湖心岛森林浴场,PM2.5平均浓度排序为花海湖心岛竹林森林浴场。各监测点TSP、PM10、PM2.5等级均在"Ⅱ"以上,未达到污染水平,因此,空气颗粒物指标对森林康养、森林旅游等活动的时间和地点均无限制。 相似文献
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城市森林净化大气颗粒物污染作用研究进展 总被引:2,自引:0,他引:2
粉尘颗粒物污染,尤其是PM2.5污染,是我国大气污染的主要问题.城市森林和绿地是城市生态系统中具有自净功能的重要组成部分,利用城市森林和绿地治理大气颗粒物污染受到越来越多的关注,并具有良好的应用前景.文章概述我国粉尘颗粒物污染状况,并总结了植物净化大气污染研究概况,从4个角度总结目前城市森林与PM2.5的关系研究,包括森林对颗粒物吸附机制、PM2.5对植物的危害影响、不同尺度下植被移除PM2.5的效果比较以及影响吸附过程的其他因素,提出了今后研究的可能发展方向,包括扩大研究树种的范围、针对研究不同树种特异性吸附偏好及加强各尺度研究的结合等,以更有效地应用城市森林进行大气污染修复. 相似文献
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Atmospheric particulate matter(PM2.5) seriously influences air quality. It is considered one of the main environmental triggers for lung and heart diseases. Air pollutants can be adsorbed by forest. In this study we investigated the effect of forest cover on urban PM2.5 concentrations in 12 cities in Heilongjiang Province,China. The forest cover in each city was constant throughout the study period. The average daily concentration of PM2.5 in 12 cities was below 75 lg/m^3 during the non-heating period but exceeded this level during heating period. Furthermore, there were more moderate pollution days in six cities. This indicated that forests had the ability to reduce the concentration of PM2.5 but the main cause of air pollution was excessive human interference and artificial heating in winter. We classified the 12 cities according to the average PM2.5 concentrations. The relationship between PM2.5 concentrations and forest cover was obtained by integrating forest cover, land area,heated areas and number of vehicles in cities. Finally,considering the complexity of PM2.5 formation and based on the theory of random forestry, we selected six cities and analyzed their meteorological and air pollutant data. The main factors affecting PM2.5 concentrations were PM10,NO_2, CO and SO_2 in air pollutants while meteorological factors were secondary. 相似文献
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Xiongwen Chen 《Journal of Sustainable Forestry》2013,32(4):261-279
ABSTRACTThe quantification of major biophysical features of forest and urban areas is important for assessing ecological service from land use change and is necessary for sustainable regional planning. This study compares biophysical indicators related to local climate, air quality, and hydrology using remote sensing and derived data at a representative forest area to a nearby urban area located in Huntsville, Alabama. Results indicate that (a) there was a higher albedo, a lower average air temperature, and 10% more annual precipitation in the forest area; the assumed air conditioner working time was about 7 days more per year in the urban area; (b) there was better air quality in the forest area based on lower levels of PM2.5, PM10, and SO2; and (c) there was a higher latent heat, more runoff per year (both aboveground and belowground runoff), and a greater soil water content at the forest area. Although Huntsville is a small city, there were some profound biophysical differences in this urban area compared to the nearby forest. These results are useful for analyzing sustainability, planning regional resources (e.g., energy, air, and water), and estimating ecological services from forests. 相似文献
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利用长春市6个环境空气质量监测国控点位的数据,研究长春市最近5 a在平稳快速建设与发展的环境下城市空气污染的特征。结果表明:空气环境中PM10经常为长春市首要污染物,5 a年均值高于国家二级标准,呈逐年攀升态势;SO2浓度年均值远低于国家二级标准,呈平稳上升态势;NO2浓度年均值为国家一级标准,采暖期浓度值略高于非采暖期,呈稳中有升态势。污染主要源于燃煤增加、机动车增加、气象条件不利等因素。针对长春市空气污染的特征提出了防治建议与对策。 相似文献
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利用2019和2020年空气质量数据,进行了春节期间烟花禁放对安庆市空气质量的效果评估。结果表明:安庆市2020年烟花禁放后,春节期间优良天气比例为87.5%,比2019年提高25%,没有出现中度污染以上等级的天气。2020年除夕及正月初一,安庆市PM10及PM2.5的峰值浓度比2019年同期分别降低了78.8%、70.5%,SO2及NO2略有下降。2020年春节期间,烟花燃放对PM10及PM2.5的平均贡献量比2019年分别下降了81.7%、76.4%,说明烟花禁放起到了显著的污染削峰作用。此外,2020年春节期间城区及市郊PM10及PM2.5浓度比禁燃前都有所下降,且城区的峰值浓度比市郊下降得更为显著,禁放后PM10及PM2.5质量浓度的空间差异性进一步缩小。 相似文献