Ground-Level NO2 in Urban Beijing: Trends, Distribution, and Effects of Emission Reduction Measures

Cheng, Ning; Chen, Chen; Cheng, Bingfen; Sun, Feng; Wang, Buying; Li, Qian; Peng, Wei

doi:10.4209/aaqr.2017.02.0092

Cited by 27 publications

(12 citation statements)

References 30 publications

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“…When the concentration of NO 2 from the automobile exhaust was reduced due to the reduction in trip intensity, the NO 2 sources from the combustion of fossil fuels, such as power plants continued normal operations and produced atmospheric pollutants. NO x from vehicle emissions has a significant impact on the concentration of NO 2 in the urban atmospheric environment (Cheng et al, 2018). It can be seen that NO 2 concentrations in the three cities from January 12 to March 26, 2020 were obviously reduced, indicating that a series of measures for epidemic prevention reduced NO 2 industrial and traffic emissions.…”

Section: No2 Concentrationmentioning

confidence: 95%

“…Nitrogen dioxide (NO 2 ) mainly comes from social production activities such as chemical plants and motor vehicles (Cheng et al, 2018). NO 2 levels are often low and pose little immediate threat to human health.…”

Section: No2 Concentrationmentioning

confidence: 99%

“…The trip intensity and daily concentrations of NO 2 from January 12 to March 27 2019 and those of 2020 during the same period in Shenzhen, Guangzhou and Foshan respectively. comes from social production activities such as chemical plants and motor vehicles (Cheng et al, 2018). When the concentration of NO 2 from the automobile exhaust was reduced due to the reduction in trip intensity, the NO 2 sources from the combustion of fossil fuels, such as power plants continued normal operations and produced atmospheric pollutants.…”

Section: No2 Concentrationmentioning

confidence: 99%

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Impact of the COVID-19 Event on Trip Intensity and Air Quality in Southern China

Wan

Cui

Wang

et al. 2020

Aerosol Air Qual. Res.

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The COVID-19 epidemic discovered and reported at the end of December 2019 and began spreading rapidly around the world. The impact of the COVID-19 event on the trip intensity, AQI (air quality index), and air pollutants, including PM 2.5 , PM 10 , SO 2 , CO, NO 2 , and O 3 in Shenzhen, Guangzhou, and Foshan (the so-called 'three cities') from January 12 to March 27, in 2019 and 2020, are compared and discussed. In 2020, the combined trip intensity in the three cities ranged between 0.73 and 5.54 and averaged 2.57, which was 28.4% lower than that in 2019. In terms of the combined AQIs for the three cities, from January 12 to March 26, 2020, the daily AQIs ranged between 21.0 and 121.3 and averaged 56.4, which was 16.0% lower than that in 2019. The average AQIs in order were Guangzhou (57.5) > Foshan (54.1) > Shenzhen (44.1). In 2019, the distribution proportions of the six AQI classes were 45.2%, 50.4%, 4.40%, 0%, 0%, and 0%, respectively, while those in 2020 were 62.7%, 37.3%, 0%, 0%, 0% and 0%, respectively. For the combined data for the three cities, on the top five days with the highest AQIs during the epidemic period, the average concentrations of

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Section: No2 Concentrationmentioning

confidence: 95%

Section: No2 Concentrationmentioning

confidence: 99%

Section: No2 Concentrationmentioning

confidence: 99%

See 1 more Smart Citation

Impact of the COVID-19 Event on Trip Intensity and Air Quality in Southern China

Wan

Cui

Wang

et al. 2020

Aerosol Air Qual. Res.

View full text Add to dashboard Cite

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“…In the past, ground-based real-time monitoring [8], aerial survey [9], and satellite remote sensing have been used to study the temporal and spatial variation in NO x and other atmospheric pollutants on urban and larger spatial scales [10]. Studies have shown that the daily variation in NO x tends to be significantly bimodal.…”

Section: Introductionmentioning

confidence: 99%

Analysis of NOx Pollution Characteristics in the Atmospheric Environment in Changchun City

Wang

Tan

et al. 2019

Atmosphere

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Nitrogen oxide (NOx) pollution has become one of the most challenging problems in China in the past 20 years. In this study, on the basis of the Jilin Province Atmospheric Environmental Quality Bulletin and hourly NOx data from the Atmospheric Environment Automatic Monitoring Station in Changchun, temporal and spatial variations in NOx concentration in the province and Changchun and their relationships with various pollutants and meteorological factors were analyzed. The results show that Changchun had the highest NOx concentration of all cities in the province, with a high concentration in the center and a low concentration in the east and west. The areas with high NOx concentrations in Changchun were mainly distributed in urban centers, and the concentration in the northern part of the city was higher than that in the south. The seasonal variation and average daily variation in NOx concentration in Changchun had a bimodal distribution, and the NOx concentration in autumn and winter was higher than that in spring and summer. The maximum monthly average concentrations of NOx and nitric oxide (NO) were reached in October, and the maximum monthly average concentration of nitrogen dioxide (NO2) was reached in March. The average daily variation in NOx concentration first peaked at 07:00–08:00 in the morning, and the second peak occurred between 20:00 and 22:00 at night. The NOx concentration in Changchun was positively correlated with NO2, NO, PM2.5 (fine particulate matter), PM10 (particulate matters), CO (carbon monoxide), and pressure, and it showed a significant negative correlation with O3, temperature, wind speed, and humidity.

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“…There are also many reports on the spatial and temporal changes in gas and particulate pollutants in China, but most of them are limited to a city or a certain type of pollutants [11][12][13][14][15][16]. For example, Zhou et al studied the spatiotemporal changes in air quality in Beijing [11], Guo et al used ground observations to assess the PM 2.5 concentration and exposure throughout China [12], and Chen et al reported spatiotemporal changes in PM 2.5 and their relationship to meteorological factors in Nanjing City [13], among many other studies.…”

Section: Introductionmentioning

confidence: 99%

The spatiotemporal characteristics of the air pollutants in China from 2015 to 2019

2020

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China's rapid industrialization and urbanization have led to poor air quality, and air pollution has caused great concern among the Chinese public. Most analyses of air pollution trends in China are based on model simulations or satellite data. Studies using field observation data and focusing on the latest data from environmental monitoring stations covering the whole country to assess the latest trends of different pollutants in different regions are relatively rare. The State Council of China promulgated the toughest-ever Air Pollution Prevention and Control Action Plan (Action Plan) in 2013. This led to a major improvement in air quality. We use the hourly Air Quality Index (AQI) and mass concentrations of PM 2.5 , PM 10 , CO, NO 2 , O 3 , and SO 2 in 362 cities from 2015 to 2019, obtained from the Ministry of Ecology and Environment, to study their temporal and spatial changes and assess the effectiveness of the policy on the atmospheric environment since its promulgation and implementation. We found that the national and regional air quality in China continues to improve, with PM 2.5 , PM 10 , AQI, CO, and SO 2 exhibiting negative trends. However, O 3 and NO 2 pollution is an urgent problem that needs to be solved and the current control strategy for PM 2.5 will only partially reduce the PM 2.5 pollution in the western region. Although the implementation of "Action Plan" measures has effectively improved air quality, China's air pollution is still serious and far from the WHO standard. Implementing measures for continuous and effective emissions control is still a top priority.

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Ground-Level NO2 in Urban Beijing: Trends, Distribution, and Effects of Emission Reduction Measures

Cited by 27 publications

References 30 publications

Impact of the COVID-19 Event on Trip Intensity and Air Quality in Southern China

Impact of the COVID-19 Event on Trip Intensity and Air Quality in Southern China

Analysis of NOx Pollution Characteristics in the Atmospheric Environment in Changchun City

The spatiotemporal characteristics of the air pollutants in China from 2015 to 2019

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