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首页> 外文会议>Air Waste Management Association's Annual conference Exhibition >Regional Modeling of Air Toxic Contaminants
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Regional Modeling of Air Toxic Contaminants

机译：空气有毒污染物的区域造型

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The South Coast Air Quality Management District (District) conducted a Multiple Air Toxics Exposure Study (MATES-II) in the South Coast Air Basin. The study included monitoring of various air toxic pollutants throughout the metropolitan Los Angeles area for a one-year period, development of spatially and temporally resolved air toxic emission inventories, modeling air toxic concentrations and risk assessment. In this presentation, we describe the air toxic modeling aspect of the study. Toxic air contaminants were modeled using a photochemical dispersion model in both the inert mode and a modified version of the reactive mode. The modeling region comprised a 210x120 km area with 2 km grid resolution which included the metropolitan Los Angeles area. Two-dimensional temperature and mixing height fields and three-dimensional wind fields were developed for a one-year period from April 1998 to March 1999. Gridded hourly emissions of air toxic compounds for the one-year period were generated from organic gas and particulate matter emissions inventories by applying source-specific speciation profiles. Model performance was evaluated against available 24-hour and long-term average ambient measurements from the same one-year period. The modeled concentration fields were used to assess potential cancer risk from exposure to air toxic contaminants. This region-wide assessment of risk provides background concentrations and risk levels for assessing impact of point source emissions. Furthermore, it provides a way to estimate the health benefit from reduction of ambient concentrations of air toxics due to implementation of ozone and PM control strategies.
机译：南海岸空气质量管理区（区）进行了南海岸空气盆地多重空气中有毒物质暴露研究（MATES-II）。这项研究包括整个大都市洛杉矶地区监测空气中的各种有毒污染物的为一年期，空间和时间分辨空气中的有毒排放清单的发展，模拟空气中的有毒浓度和风险评估。在本次讲座中，我们描述研究空气中的有毒建模方面。有毒的空气中的污染物，使用在惰性模式和反应模式的修改版本二者光化学扩散模型建模。建模区域包含有2公里网格分辨率210x120公里的地区，其中包括大都市洛杉矶地区。二维温度和混合高度字段和三维风场进行了一年期间开发的从1998年4月到1999年3月网格为一年期间空气有毒化合物的每小时排放有机气体和颗粒物质产生排放清单通过施加特定源物种轮廓。型号性能对来自同一个1年期可用24小时和长期的平均环境测量评估。建模的浓度场被用来从曝光评估潜在的癌症风险空气中的有毒污染物。该区域范围内的风险评估提供了背景浓度和风险水平评估点源排放的影响。此外，它提供了从减少有毒气体的环境浓度的健康益处的估计由于实施臭氧和PM控制策略的一种方式。

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