scholarly journals Supplementary material to "Dominant role of emission reduction in PM<sub>2.5</sub> air quality improvement in Beijing during 2013–2017: a model-based decomposition analysis"

2018 ◽  
Author(s):  
Jing Cheng ◽  
Jingping Su ◽  
Tong Cui ◽  
Xiang Li ◽  
Xin Dong ◽  
...  
Keyword(s):  
Quality Improvement ◽  
Air Quality ◽  
Emission Reduction ◽  
Dominant Role ◽  
Decomposition Analysis ◽  
Model Based ◽  
Air Quality Improvement ◽  
Supplementary Material

scholarly journals Does Environmental Inspection Led by the Central Government Improve the Air Quality in China? The Moderating Role of Public Engagement

2020 ◽  
Vol 12 (8) ◽  
pp. 3316 ◽  
Author(s):  
Fang Xu ◽  
Meng Tian ◽  
Jie Yang ◽  
Guohu Xu
Keyword(s):  
Air Pollution ◽  
Quality Improvement ◽  
Air Quality ◽  
Public Engagement ◽  
Local Governments ◽  
Central Government ◽  
Heating Period ◽  
Air Quality Improvement ◽  
The Impact

The severe air pollution in China has imperiled public health and resulted in substantial economic loss. To tackle the unprecedented pollution challenges, China has launched a campaign-based environmental inspection over all regions to impel local governments’ actual pollution abatement. At the same time, with the public’s awakening awareness about environmental protection, the public has also played a particularly vital role in this inspection. Under this circumstance, the study tries to reveal the impact of Environmental Inspection led by the Central Government (EICG) on air quality improvement, and to examine the role of public engagement in their relationship. Specifically, utilizing daily data covering 249 prefecture-level cities in China from 1 June 2015 to 31 May 2018, this study employed multiple regression models and then found that due to the implementation of EICG, the concentrations of PM2.5, PM10, SO2 and NO2 decline by 2.642 μg/m3, 6.088 μg/m3, 1.357 μg/m3 and 1.443 μg/m3, respectively, and the air quality index decreases by 2.4 in total, which implies that EICG can improve the air quality to a great extent. However, the coefficients for major variables change from negative to positive, suggesting that an attenuation effect of EICG on air quality improvement exists in Chinese institutional background. Meanwhile, public engagement is shown to enhance the positive association between EICG and air quality improvement. Additionally, further analysis demonstrates that EICG promotes the improvement in air quality up to three months after the inspection in cities during the heating period, while the positive effect has existed during one month before the inspection in cities during the non-heating period. Additionally, in contrast to the instant effect in cities not specially monitored, there is a lagged effect of EICG in controlling the air pollution in cities specially monitored.

The role of a peri-urban forest on air quality improvement in the Mexico City megalopolis

2012 ◽  
Vol 163 ◽  
pp. 174-183 ◽  
Author(s):  
Darrel Baumgardner ◽  
Sebastian Varela ◽  
Francisco J. Escobedo ◽  
Alicia Chacalo ◽  
Carlos Ochoa
Keyword(s):  
Quality Improvement ◽  
Air Quality ◽  
Mexico City ◽  
Urban Forest ◽  
Air Quality Improvement

scholarly journals Impacts of emission reduction and meteorological conditions on air quality improvement during the 2014 Youth Olympic Games in Nanjing, China

2017 ◽  
Vol 17 (21) ◽  
pp. 13457-13471 ◽  
Author(s):  
Qian Huang ◽  
Tijian Wang ◽  
Pulong Chen ◽  
Xiaoxian Huang ◽  
Jialei Zhu ◽  
...  
Keyword(s):  
Quality Improvement ◽  
Air Quality ◽  
Emission Reduction ◽  
Olympic Games ◽  
Model Simulation ◽  
Weather Conditions ◽  
Ambient Air ◽  
Quality Standard ◽  
Control Measures ◽  
Air Quality Improvement

Abstract. As the holding city of the 2nd Youth Olympic Games (YOG), Nanjing is highly industrialized and urbanized, and faces several air pollution issues. In order to ensure better air quality during the event, the local government took great efforts to control the emissions from pollutant sources. However, air quality can still be affected by synoptic weather, not only emission. In this paper, the influences of meteorological factors and emission reductions were investigated using observational data and numerical simulations with WRF–CMAQ (Weather Research and Forecasting – Community Multiscale Air Quality). During the month in which the YOG were held (August 2014), the observed hourly mean concentrations of SO2, NO2, PM10, PM2.5, CO and O3 were 11.6 µg m−3, 34.0 µg m−3, 57.8 µg m−3, 39.4 µg m−3, 0.9 mg m−3 and 38.8 µg m−3, respectively, which were below China National Ambient Air Quality Standard (level 2). However, model simulation showed that the weather conditions, such as weaker winds during the YOG, were adverse for better air quality and could increase SO2, NO2, PM10, PM2.5 and CO by 17.5, 16.9, 18.5, 18.8, 7.8 and 0.8 %. Taking account of local emission abatement only, the simulated SO2, NO2, PM10, PM2.5 and CO decreased by 24.6, 12.1, 15.1, 8.1 and 7.2 %. Consequently, stringent emission control measures can reduce the concentrations of air pollutants in the short term, and emission reduction is very important for air quality improvement during the YOG. A good example has been set for air quality protection for important social events.

scholarly journals Evaluating the Recent 2+26 Regional Strategy for Air Quality Improvement During Two Orange Air Pollution Alerts in Beijing: variations of PM<sub>2.5</sub> concentrations, source apportionment, and the relative contribution of local emission and regional transport

2018 ◽  
Author(s):  
Ziyue Chen ◽  
Danlu Chen ◽  
Nianliang Cheng ◽  
Yan Zhuang ◽  
Mei-Po Kwan ◽  
...  
Keyword(s):  
Air Pollution ◽  
Quality Improvement ◽  
Air Quality ◽  
Coal Combustion ◽  
Emission Reduction ◽  
Regional Strategy ◽  
Relative Contribution ◽  
Local Emission ◽  
Air Quality Improvement ◽  
Pollution Episodes

Abstract. To comprehensively evaluate the effects of the recent 2+26 regional strategy for air quality improvement, we compared the variations in PM2.5 concentrations in Beijing during four pollution episodes with different emission-reduction strategies. The 2+26 strategy implemented in March 2018 led to a mean PM2.5 concentrations of 16.43 % lower than that during the pollution episode in March 2013, when no specific emission-reduction measures were in place. The same 2+26 strategy implemented in November 2017 led to a mean PM2.5 concentrations of 32.70 % lower than that during the pollution episode in November 2016, when local emission-reduction measures were implemented. The results suggested that the effects of the 2+26 regional emission-reduction measures on PM2.5 reductions were influenced by a diversity of factors and could differ significantly during specific pollution episodes. Furthermore, we found the proportions of sulfate ions decreased significantly and nitrate ions were the dominant PM2.5 components during the two 2+26 orange alert periods. Meanwhile, the relative contributions of coal combustion to PM2.5 concentrations in Beijing during the pollution episodes in March 2013, November 2016, November 2017 and March 2018 was 40 %, 34 %, 28 % and 11 % respectively, indicating that the recent Coal to Gas project and the contingent 2+26 strategy led to a dramatic decrease in coal combustion in the Beijing-Tianjin-Hebei Region. On the other hand, the relative contribution of vehicle exhaust during the 2+26 orange alert periods in November 2017 and March 2018 reached 40 % and 54 % respectively. The relative contribution of local emission to PM2.5 concentrations in Beijing also varied significantly and ranged from 49.46 % to 89.35 % during the four pollution episodes. These results suggested that the 2+26 regional emission-reduction strategy should be implemented with red air pollution alerts during heavy pollution episodes to intendedly reduce the dominant contribution of vehicle exhausts to PM2.5 concentrations in Beijing, while specific emission-reduction measures should be implemented accordingly for different cities within the 2+26 framework.

Emission reduction in CI engine using biofuel reformulation strategies through nano additives for atmospheric air quality improvement

2020 ◽  
Vol 147 ◽  
pp. 2295-2308 ◽  
Author(s):  
S. Abdul Sheriff ◽  
Indrala Kishan Kumar ◽  
Petluri Sai Mandhatha ◽  
Samraj Sunder Jambal ◽  
Raja Sellappan ◽  
...  
Keyword(s):  
Quality Improvement ◽  
Air Quality ◽  
Emission Reduction ◽  
Atmospheric Air ◽  
Air Quality Improvement ◽  
Ci Engine ◽  
Nano Additives

scholarly journals Impacts of emission reduction and meteorological conditions on air quality improvement during the 2014 Youth Olympic Games in Nanjing, China

2017 ◽  
Author(s):  
Qian Huang ◽  
Tijian Wang ◽  
Pulong Chen ◽  
Xiaoxian Huang ◽  
Jialei Zhu ◽  
...  
Keyword(s):  
Quality Improvement ◽  
Air Quality ◽  
Emission Reduction ◽  
Olympic Games ◽  
Weather Conditions ◽  
Ambient Air ◽  
Quality Standard ◽  
Control Measures ◽  
Dominant Factor ◽  
Air Quality Improvement

Abstract. As the holding city of the 2nd Youth Olympic Games (YOG), Nanjing is highly industrialized and urbanized facing with several air pollution issues. In order to ensure better air quality during the event, the local government took great efforts to control the pollution emissions. However, air quality can still be affected by meteorology. In this paper, the influences of meteorological factors and emission reductions were investigated using observational data and numerical simulations with WRF/CMAQ. During the YOG (August, 2014), the concentration of SO2, NO2, PM10, PM2.5, CO and O3 was 11.6 μg/m3, 34.0 μg/m3, 57.8 μg/m3, 39.4 μg/m3, 0.9 μg/m3, and 38.8 μg/m3, respectively, which were under China National Ambient Air Quality Standard. However, simulation showed that the weather conditions such as weaker winds during the holding time were adverse for better air quality, and raised SO2, NO2, PM10, PM2.5 and CO by 17.5 %, 16.9 %, 19.0 %, 19.5 %, 7.8 % and 0.8 %, respectively. Taking account of local emission abatement only, SO2, NO2, PM10, PM2.5 and CO was decreased by 24.6 %, 12.1 %, 14.5 %, 6.9 % and 7.2 %, respectively. Consequently, stringent emission control measures can reduce the concentrations of air pollutants in short term, and emission reduction is the dominant factor of the air quality improvement during the YOG, which has set up a good example in air protection for important social events.

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