[논문]Optimal redistribution of an urban air quality monitoring network using atmospheric dispersion model and genetic algorithm

Hao, Yufang; Xie, Shaodong

doi:10.1016/j.atmosenv.2018.01.011

Optimal redistribution of an urban air quality monitoring network using atmospheric dispersion model and genetic algorithm

Atmospheric environment, v.177, 2018년, pp.222 - 233

Hao, Yufang (Corresponding author.) , Xie, Shaodong

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Abstract Air quality monitoring networks play a significant role in identifying the spatiotemporal patterns of air pollution, and they need to be deployed efficiently, with a minimum number of sites. The revision and optimal adjustment of existing monitoring networks is crucial for cities that have undergone rapid urban expansion and experience temporal variations in pollution patterns. The approach based on the Weather Research and Forecasting–California PUFF (WRF-CALPUFF) model and genetic algorithm (GA) was developed to design an optimal monitoring network. The maximization of coverage with minimum overlap and the ability to detect violations of standards were developed as the design objectives for redistributed networks. The non-dominated sorting genetic algorithm was applied to optimize the network size and site locations simultaneously for Shijiazhuang city, one of the most polluted cities in China. The assessment on the current network identified the insufficient spatial coverage of SO2 and NO2 monitoring for the expanding city. The optimization results showed that significant improvements were achieved in multiple objectives by redistributing the original network. Efficient coverage of the resulting designs improved to 60.99% and 76.06% of the urban area for SO2 and NO2, respectively. The redistributing design for multi-pollutant including 8 sites was also proposed, with the spatial representation covered 52.30% of the urban area and the overlapped areas decreased by 85.87% compared with the original network. The abilities to detect violations of standards were not improved as much as the other two objectives due to the conflicting nature between the multiple objectives. Additionally, the results demonstrated that the algorithm was slightly sensitive to the parameter settings, with the number of generations presented the most significant effect. Overall, our study presents an effective and feasible procedure for air quality network optimization at a city scale. Highlights The current AQMN was evaluated based on the simulated concentration fields. The AQMN redistributions were optimized using NSGA-II approach in multi-objective. The resulting designs showed good spatial representations for the expanding city. The optimal networks for single and multi-pollutant presented similar configurations. Graphical abstract The graph abstract outlines the workflow of the air quality network optimal redistribution for SO2 monitoring from the manuscript. [DISPLAY OMISSION]

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Optimal redistribution of an urban air quality monitoring network using atmospheric dispersion model and genetic algorithm

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