...
首页> 外文期刊>Atmospheric environment >Fine particulate concentrations on sidewalks in five Southern California cities
【24h】

Fine particulate concentrations on sidewalks in five Southern California cities

机译:南加州五个城市人行道上的细颗粒物浓度

获取原文
获取原文并翻译 | 示例
           

摘要

This research provides an exploratory examination of the factors associated with fine particle concentrations in intersection and sidewalk microenvironments in five study areas in the Los Angeles region. The study areas range from low-density, auto-oriented development patterns to dense urban areas with mid- and high-rise buildings. Average concentrations of FPdt (fine particle concentrations measured with DustTrak Aerosol Monitors) ranged from about 20 to 70 ug m~(-3) across study areas during stationary and mobile (walking) monitoring in morning, midday, and evening periods. Results suggest that fine particle concentrations are highly variable on urban sidewalks. A regression analysis shows that concentrations are associated with traffic and the proximate built environment characteristics after accounting for meteorological factors, time of day, and location in the region. Regressions show higher concentrations were associated with lower wind speeds and higher temperatures, higher adjacent passenger vehicle traffic, higher ambient concentrations, and street canyons with buildings of over five stories. Locations in street canyons with 2—5 story buildings and with more paving and open space had lower concentrations after accounting for other factors. The associations with traffic and built environment variables explained a small amount of the variation in FPdt concentrations, suggesting that future research should examine the relative role of localized traffic and built environment characteristics compared to regional ambient concentrations and meteorology.
机译:这项研究对洛杉矶地区五个研究区的交叉路口和人行道微环境中的微粒浓度相关因素进行了探索性检查。研究范围从低密度,面向汽车的开发模式到具有中高层建筑的密集城市地区。 FPdt的平均浓度(用DustTrak气溶胶监测仪测得的细颗粒浓度)在早晨,中午和晚上的静止和移动(步行)监测期间,研究区域的平均浓度约为20至70 ug m〜(-3)。结果表明,城市人行道上的细颗粒物浓度变化很大。回归分析表明,在考虑了气象因素,一天中的时间以及该地区的位置之后,浓度与交通量和附近的建筑环境特征相关。回归显示,较高的浓度与较低的风速和较高的温度,较高的相邻乘用车流量,较高的环境浓度以及具有五层以上建筑物的街道峡谷有关。考虑到其他因素,在街道峡谷中拥有2至5层建筑物且铺路和开放空间较大的位置的集中度较低。与交通和建筑环境变量的关联解释了FPdt浓度的少量变化,这表明,与区域环境浓度和气象相比,未来的研究应研究局部交通和建筑环境特征的相对作用。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号