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- W4378530995 abstract "Tehran faces a significant health challenge due to severe air pollution episodes during wintertime, which are associated with high concentrations of fine particulate matter with a diameter less than 2.5 µm (PM2.5). In this study, we investigated meteorology conditions of one of the severe air pollution episodes, occurred from 27th December 2020 to 15th January 2021, using the Weather Research and Forecasting (WRF) model. To gain insights into this episode, we also modeled a clean episode for comparison. Model validation of land surface temperature using remote sensing showed acceptable performance as well as ground observations for other parameters. We then calculated the ventilation coefficient (VC) from the WRF outputs and analyzed the results statistically. Results indicate the severe reduction in both VC and planetary boundary layer height (PBLH) during the polluted episode. We further linked the decrease in PBLH and VC of the polluted episode to a high-pressure system above 1020 hPa. In contrast, the results for the clean episode indicate that the low-pressure system as low as 1010 hPa led to higher PBLH and VC than during the polluted episode. This low-pressure system favors the reduction of PM2.5 levels to lower than 21 μgm−3." @default.
- W4378530995 created "2023-05-28" @default.
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- W4378530995 date "2023-05-27" @default.
- W4378530995 modified "2023-09-25" @default.
- W4378530995 title "Role of urban boundary layer dynamics and ventilation efficiency in a severe air pollution episode in Tehran, Iran" @default.
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- W4378530995 doi "https://doi.org/10.1007/s00703-023-00972-3" @default.
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