基于AERMOD模型评估公路交通源PM_(2.5)的浓度分布

Assessment of the Concentration Distribution of Mobile Source PM_(2.5) Based on AERMOD Model

PM2.5是公路机动车主要污染物之一,对沿线居民的呼吸健康有直接的危害,因此有必要在公路建设环境影响评价中增加对交通源PM2.5扩散浓度的评估。本文通过分析空气质量模型AERMOD、PM2.5排放清单测算模型MOVES以及建模数据需求,在交通量调查、气象数据预处理以及道路源PM2.5排放清单测算的基础上,应用AERMOD模型评估了我国某高速公路沿线PM2.5的浓度分布水平。结果表明:在研究路段沿线下风向距路肩400m范围内,均受到公路交通源PM2.5污染(PM2.5净浓度≥4μg/m3)的影响;AERMOD模型可以精细化地评估道路机动车PM2.5对空气质量的影响,为道路沿线PM2.5浓度分布评估提供了一套研究方法,其评估结果对道路规划环境影响评价具有重要的参考价值。

PM2.5 is one kind of main pollutants from highway vehicles and produces harmful effect on human car- diopulmonary heath. Therefore,it is necessary to add PM2. 5 from mobile source to guidelines for the assessment of highway construction＇s impact on environment. This paper analyzes air quality model AERMOD, PM2.5 emission inventory estimation model MOVES and data needed for modeling. Based on the traffic monitoring, meteorology data preprocessing and mobile source PM2.5 emission inventory estimation,the paper assesses the concentration distri- bution of PM2.5 along a highway by using AERMOD system. The results show that in the range of downwind 400 m from road shoulder,the air quality is influenced by mobile source PM2.5 （PM2.5 net concentration≥4 μg/m3） ; AERMOD model can precisely assess the influence of PM2.5 on air quality along roadside, and provide a method for assessing PM2.5 concentration level in road areas. The research has some reference values to the assessment of road planning＇s impact on environment.