Gaseous air pollutants dispersion emitted from point and line sources by coupling WRF-AERMOD models (Case study: Lowshan, Guilan Province, Iran)

Q3 Agricultural and Biological Sciences
Sima Farivar Ghaziani, A. A. Orkomi, M. Rajabi
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引用次数: 1

Abstract

The cement factories in urban areas can affect the air quality of cities due to the variety of pollutants emitted from cement production processes. In the present study, the impacts of the Khazar cement factory and two transportation axes between Guilan and Qazvin provinces were investigated on the air quality of Lowshan in Guilan Province, Iran in 2019. Due to the lack of suitable meteorological data for dispersion modeling, the WRF model was used to predict the meteorological parameters. The pollutants dispersion modeling was conducted by AERMOD software and the accuracy of results was confirmed by field measurements of NO2 obtained by passive samplers. The CO and NO2 dispersion modeling results showed that the air quality of Lowshan is in an acceptable situation compared to the ambient air quality standards. So that, the maximum one-hour concentration of NO2 in most residential areas was lower than the ambient standard, and only in small parts of the areas close to line sources, the concentration value was close to the standard limits. The maximum value of annually-averaged concentration of NO2 and the maximum one-hour concentration of CO were 17 ppb and 2.5 ppm, respectively, which are much lower than the clean air standards. Further investigation showed that in the cold weather seasons, due to the less vertical displacement of air and the decrease in the boundary layer height, the concentration of pollutants in the urban environment is higher than that in the warm weather seasons. Considering the night and day time wind roses showed that despite the existence of valley-mountain structure in the city, the air quality of the city is not affected by the mountain and valley breezes and also night and day wind roses do not follow the trend of these breezes.
基于WRF-AERMOD耦合模型的点源和线源大气气态污染物扩散研究(以伊朗桂兰罗山为例)
由于水泥生产过程中排放的各种污染物,城市地区的水泥厂会影响城市的空气质量。在本研究中,调查了2019年Khazar水泥厂和吉兰省和加兹温省之间的两条运输轴线对伊朗吉兰省Lowshan空气质量的影响。由于缺乏合适的气象数据进行离散建模,因此使用WRF模型来预测气象参数。通过AERMOD软件进行污染物扩散建模,通过被动采样器获得的NO2现场测量结果证实了结果的准确性。CO和NO2扩散建模结果表明,与环境空气质量标准相比,Lowshan的空气质量处于可接受的状态。因此,大多数居民区NO2的最大一小时浓度低于环境标准,只有在靠近线源的小部分地区,浓度值接近标准限值。NO2的年平均浓度最大值和CO的一小时最大浓度分别为17ppb和2.5ppm,远低于清洁空气标准。进一步调查表明,在寒冷天气季节,由于空气的垂直位移较小,边界层高度降低,城市环境中的污染物浓度高于温暖天气季节。考虑到昼夜风玫瑰,表明尽管城市存在山谷山结构,但城市的空气质量不受山谷风的影响,昼夜风玫瑰也不遵循这些风的趋势。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
caspian journal of environmental sciences
caspian journal of environmental sciences Environmental Science-Environmental Science (all)
CiteScore
2.30
自引率
0.00%
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0
审稿时长
5 weeks
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