Nonlinear influence of winter meteorology and precursor on PM2.5 based on mathematical and numerical models: A COVID-19 and Winter Olympics case study

Wang, Xiaoqi; Duan, Wenjiao; Zhu, Jiaxian; Wei, Wei; Cheng, Shuiyuan; Mao, Shushuai

doi:10.1016/j.atmosenv.2022.119072

Cited by 9 publications

(8 citation statements)

References 53 publications

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“…The shifts in the feature importance of O 3 and NO 2 from Pre-WO to WO result from regulation of anthropogenic emissions. During the WO period, the reduction of anthropogenic emissions resulted in a decline in NO x levels and probably caused an elevation in O 3 concentrations due to reduced O 3 consumption by NO. , Overall, the results obtained from machine learning (Figure S8a) demonstrated that the low O 3 levels, moderate NO 2 concentrations, and high NO levels continuously limited the formation of the NO 3 radical during Pre-WO. On the other hand, the steady-state analysis complemented machine learning to address the N 2 O 5 uptake (Table S2 and Figure S5a).…”

Section: Resultsmentioning

confidence: 85%

Identifying Driving Factors of Atmospheric N₂O₅ with Machine Learning

Chen,

Ma,

Zheng

et al. 2024

Environ. Sci. Technol.

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Section: Resultsmentioning

confidence: 85%

Identifying Driving Factors of Atmospheric N₂O₅ with Machine Learning

Chen,

Ma,

Zheng

et al. 2024

Environ. Sci. Technol.

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“…In addition, compared to the periods BWO and DWP, the temperature and RH in Beijing during the Olympics decreased by 10.4–20.4%, and the mainly northerly average wind speed increased by ~21.7%. The favorable meteorological conditions dispersed pollutants and diluted those with lower concentrations, which ensured good air quality DWO [ 20 ].…”

Section: Resultsmentioning

confidence: 99%

Air Pollution Characteristics during the 2022 Beijing Winter Olympics

Chu

Gong

Sun

et al. 2022

IJERPH

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Using air pollution monitoring data from 31 January to 31 March 2022, we evaluated air quality trends in Beijing and Zhangjiakou before and after the 2022 Winter Olympics and compared them with the conditions during the same period in 2021. The objective was to define the air quality during the 2022 Winter Olympics. The results indicated that: (1) the average concentrations of PM2.5, PM10, NO2, CO, and SO2 in Zhangjiakou during the 2022 Winter Olympics were 28.15, 29.16, 34.96, 9.06, and 16.41%, respectively, lower than those before the 2022 Winter Olympics; (2) the five pollutant concentrations in Beijing showed the following pattern: during the 2022 Winter Olympics (DWO) < before the 2022 Winter Olympics < after 2022 Winter Paralympics < during 2022 Winter Paralympics; (3) on the opening day (4 February), the concentrations of the five pollutants in both cities were low. PM2.5 and PM10 concentrations varied widely without substantial peaks and the daily average maximum values were 15.17 and 8.67 µg/m3, respectively, which were 65.56 and 69.79% lower than those of DWO, respectively; (4) the PM2.5 clean days in Beijing and Zhangjiakou DWO accounted for 94.12 and 76.47% of the total days, respectively, which were 11.76 and 41.18% higher than those during the same period in 2021; (5) during each phase of the 2022 Winter Olympics in Beijing and Zhangjiakou, the NO2/SO2 and PM2.5/SO2 trends exhibited a decrease followed by an increase. The PM2.5/PM10 ratios in Beijing and Zhangjiakou were 0.65 and 0.67, respectively, indicating that fine particulate matter was the main contributor to air pollution DWO.

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“…However, the restrictive policy seems to have gradually changed public opinion such that the private use of fireworks has declined, resulting in lower particulate concentrations after 2018 [22]. The year 2022 revealed extremely low concentrations, as a result of not only increasing restrictions but also efforts aiming for clearer air related to preparations for the winter games that ran 4 February 2022/20 February [47,48]. There was much concern about air pollution and the interface of the games with the period of New Year celebrations [47] while COVID-19 imposed restrictions that also reduced the air pollution concentrations [48].…”

Section: Air Pollution From Fireworkmentioning

confidence: 99%

“…The year 2022 revealed extremely low concentrations, as a result of not only increasing restrictions but also efforts aiming for clearer air related to preparations for the winter games that ran 4 February 2022/20 February [47,48]. There was much concern about air pollution and the interface of the games with the period of New Year celebrations [47] while COVID-19 imposed restrictions that also reduced the air pollution concentrations [48]. There were expectations of blue skies for the Winter Olympics; a concept termed "Beijing Blue" [48] has emerged to describe improved pollution during important events ever since the Olympic Games of 2008 and the APEC (Asia-Pacific Economic Cooperation) meeting of 2015 [49].…”

Section: Air Pollution From Fireworkmentioning

confidence: 99%

Changes in Air Pollutants from Fireworks in Chinese Cities

Lai

Brimblecombe

2022

Atmosphere

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Chinese New Year has traditionally been welcomed with fireworks, but this has meant this holiday can experience intense peaks of pollutants, particularly as particulate matter. Such environmental issues add to other risks (e.g., accident, fire, and ecological and health threats) posed by firework displays, but cultural reasons encourage such celebrations. This study examines air pollution from fireworks across a time of increasingly stringent bans as a time series from 2014–2021 using a random forest (decision-tree) model to explore the effect of year-to-year weather changes on pollutant concentrations at Chinese New Year. Peak concentrations of firework pollutants have decreased in cities and hint at the importance of well-enforced regulation of these traditional celebrations, e.g., Beijing, Tianjin, and Chongqing. The model suggested relative humidity was an important controlling variable, perhaps as the presence of water vapor might also accelerate particle growth but also as a surrogate parameter related to atmospheric mixing. Bans on fireworks, resisted at first, have shown evidence of growing public acceptance. The regulations are increasingly effective, even in the outer parts of cities. Celebrations might safely return as public firework displays, including light shows and the use of lanterns.

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Nonlinear influence of winter meteorology and precursor on PM2.5 based on mathematical and numerical models: A COVID-19 and Winter Olympics case study

Cited by 9 publications

References 53 publications

Identifying Driving Factors of Atmospheric N₂O₅ with Machine Learning

Identifying Driving Factors of Atmospheric N₂O₅ with Machine Learning

Air Pollution Characteristics during the 2022 Beijing Winter Olympics

Changes in Air Pollutants from Fireworks in Chinese Cities

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Nonlinear influence of winter meteorology and precursor on PM2.5 based on mathematical and numerical models: A COVID-19 and Winter Olympics case study

Cited by 9 publications

References 53 publications

Identifying Driving Factors of Atmospheric N2O5 with Machine Learning

Identifying Driving Factors of Atmospheric N2O5 with Machine Learning

Air Pollution Characteristics during the 2022 Beijing Winter Olympics

Changes in Air Pollutants from Fireworks in Chinese Cities

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Identifying Driving Factors of Atmospheric N₂O₅ with Machine Learning

Identifying Driving Factors of Atmospheric N₂O₅ with Machine Learning