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首页> 外文学位 >Understanding air toxics and carbonyl pollutant sources in Boulder County, Colorado.
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Understanding air toxics and carbonyl pollutant sources in Boulder County, Colorado.

机译：了解科罗拉多州博尔德县的空气有毒物质和羰基污染物来源。

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摘要

Boulder County sits at the confluence of the high alpine wilderness of the Rocky Mountains, the urbanized city of Denver, Colorado, and the agricultural and intensive gas development activities in Northeast Colorado. This urban/rural interface creates a complex air quality environment characterized by shifting upslope and downslope air flow conditions that may elevate air toxics concentrations in areas with few local sources. The Denver area, including Boulder County, was designated as a non-attainment area on November 20, 2007 for failing to meet the Environmental Protection Agency's (EPA) 8-hour primary ozone standard. Therefore, the Boulder County Public Health Department (BCPH) and its partners recently completed one year of monitoring low molecular weight carbonyl compounds, volatile organic compounds (VOCs), and ground-level ozone at five locations around Boulder County to aid in air toxics source apportionment and model evaluation. Carbonyls and VOCs were collected on a 1-in-6 day schedule at each location from March 1, 2007 to February 24, 2008. In addition, meteorological data including wind speed, wind direction, temperature, and barometric pressure were collected at each location. Principal Component Analysis was used to help identify sources and other factors influencing hydrocarbon concentrations.;Each monitoring site showed different results for ozone, especially during the ozone season when values approached and occasionally exceeded the EPA primary 8-hour ozone standard. Concentrations of formaldehyde and acetaldehyde measured in the Boulder study were generally lower than those observed in earlier monitoring studies, with especially pronounced differences for acetaldehyde. Prior to the Boulder study, acetaldehyde/formaldehyde ratios measured in the Denver metropolitan area were much higher than values measured in other studies performed in the United States and abroad. Ratios from the Boulder study are more in line with those measured in other locations. Concentrations of VOCs, such as benzene and toluene, measured in the Boulder Study were similar to other studies previously conducted in Denver. Duplicate 24-hour samples collected during the Boulder study show strong agreement, as did the sum of the eight 3-hour samples collected along with the 24-hour samples. Clean field blanks collected during the Boulder Study also support the validity of the current measurements.
机译：博尔德县位于落基山脉的高山高地，科罗拉多州丹佛市的城市化城市以及科罗拉多州东北部的农业和集约化天然气开发活动的交汇处。这种城市/农村的交界处创造了一个复杂的空气质量环境，其特征是上坡和下坡的空气流动状况发生了变化，这可能会增加当地空气很少的地区的空气中毒物浓度。丹佛地区（包括博尔德县）由于未能达到环境保护署（EPA）8小时一级臭氧标准而被指定为非禁区。因此，博尔德县公共卫生局（BCPH）及其合作伙伴最近完成了为期一年的监测，以监测博尔德县周围五个地点的低分子量羰基化合物，挥发性有机化合物（VOC）和地面臭氧，以帮助寻找有毒物质分摊和模型评估。从2007年3月1日至2008年2月24日，在每个位置按1至6天的时间表收集羰基和VOC。此外，还在每个位置收集了气象数据，包括风速，风向，温度和气压。主成分分析用于帮助确定影响碳氢化合物浓度的来源和其他因素。每个监测点显示的臭氧结果不同，尤其是在臭氧季节，当数值接近并偶尔超过EPA主要的8小时臭氧标准时。在Boulder研究中测得的甲醛和乙醛浓度通常低于早期监测研究中观察到的浓度，其中乙醛的差异尤为明显。在进行Boulder研究之前，在丹佛大都市区测得的乙醛/甲醛比远高于在美国和国外进行的其他研究测得的值。博尔德研究得出的比率与其他地区的比率更为一致。在Boulder研究中测量的VOC（例如苯和甲苯）的浓度与之前在丹佛进行的其他研究相似。在Boulder研究期间收集的重复24小时样本显示出很强的一致性，同时收集了八个3小时样本和24小时样本的总和。在Boulder研究期间收集的干净的现场空白也支持当前测量的有效性。

著录项

  • 作者

    Eisele, Adam Paul.;

  • 作者单位

    University of Colorado at Boulder.;

  • 授予单位 University of Colorado at Boulder.;
  • 学科 Atmospheric Sciences.;Engineering Environmental.
  • 学位 M.E.
  • 年度 2009
  • 页码 191 p.
  • 总页数 191
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 环境污染及其防治;
  • 关键词

  • 入库时间 2022-08-17 11:37:37

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