Spatiotemporal variability of tropospheric NO2 over four megacities in Southern Africa: Implications for transboundary regional air pollution

Matandirotya, Newton R.; Burger, Roelof

doi:10.1016/j.envc.2021.100271

Cited by 10 publications

(5 citation statements)

References 40 publications

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“…Studies have reported a signi cant increase in re foci in the Cerrado, associated with the dry season and reduced rainfall in the rainy season, followed by changes in land use and land cover in the region (Silva Junior et al 2021; Oliveira-Júnior et al 2020). We found the during winter compared to spring seasons(Duncan et al 2010;Matandirotya and Burger, 2021). In addition, the high precipitation received during the rainy period means that the life expectancy of tropospheric NO 2 is reduced as it quickly reacts with water to form nitric acid(Matandirotya and Burger, 2021).…”

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confidence: 75%

“…We found the during winter compared to spring seasons(Duncan et al 2010;Matandirotya and Burger, 2021). In addition, the high precipitation received during the rainy period means that the life expectancy of tropospheric NO 2 is reduced as it quickly reacts with water to form nitric acid(Matandirotya and Burger, 2021). During monsoon periods, minimal levels of O 3 were observed due to insu cient solar radiation (clouds interaction with radiation) and pollutant washout, as well as O 3 consumption by HO x radicals.…”

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confidence: 77%

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Total column ozone (O 3 ) and nitrogen dioxide (NO 2 ) via satellite and their relationship with the burned area and climatic data in biomes of Central-West Brazil

Souza

Oliveira‐Júnior

Abreu

et al. 2022

Preprint

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The total column ozone (O3) and nitrogen dioxide (NO2) levels based on the satellite remote sensing for a period from 2005 to 2020 along with air temperature, rainfall and burned area in three biomes (Cerrado, Pantanal, and Atlantic Forest) from Mato Grosso do Sul - Brazil was evaluated. The annual variations of O3 ranged from 260 DU for the Pantanal to 347 DU for the Cerrado. Whereas the NO2 concentrations ranged from 2.95×1015 molecules for the Cerrado to 3.01×1015 molecules for the Atlantic Forest. The differences between NO2 and O3 concentrations on monthly and seasonal time scales, with higher values during the dry period (between July and October). The NO2 and O3 concentrations positively correlated with the burn areas in Pantanal and Cerrado, while the rainfall negatively correlated with these gases’ concentrations in these biomes The first principal component in all biomes is a comparison between rainfall and NO2, O3, a burned area, and air temperature with higher values of eigenvalues for the burned area in Pantanal, followed by Cerrado and Atlantic Forest, indicating more fires in Pantanal. Rainfall showed the highest value in the first principal components (PC). The second component in the Atlantic Forest was a balance between rainfall and air temperature with NO2, O3 and burned area. In the Cerrado and Pantanal, a comparison is made between burned area and NO2, with rainfall, air temperature and O3. There are differences in the behavior of NO2 and O3 concentrations in biomes, driven by different environmental and anthropic variables.

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confidence: 75%

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confidence: 77%

Total column ozone (O 3 ) and nitrogen dioxide (NO 2 ) via satellite and their relationship with the burned area and climatic data in biomes of Central-West Brazil

Souza

Oliveira‐Júnior

Abreu

et al. 2022

Preprint

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“…Nitrogen oxides are mainly produced by anthropogenic activities, including vehicular emissions, biomass burning, fossil fuel combustion, thermal power plants, domestic solid fuel use, while natural sources include lightning and soils [ 76 , 77 , 78 ]. Matandirotya and Burger [ 79 ] found that seasonal biomass burning, which increased during the winter season, was also related to the emission of nitrogen oxides. However, the BSDW policy incentives the usage, promotion, and transformation of biomass power generation; specifically, it proposes to encourage the development of county biomass cogeneration, biomass briquette boilers and biological natural gas where resources are available.…”

Section: Resultsmentioning

confidence: 99%

Does the “Blue Sky Defense War Policy” Paint the Sky Blue?—A Case Study of Beijing–Tianjin–Hebei Region, China

Yang

Wang

Chen

et al. 2021

IJERPH

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Improving air quality is an urgent task for the Beijing–Tianjin–Hebei (BTH) region in China. In 2018, utilizing 365 days’ daily concentration data of six air pollutants (including PM2.5, PM10, SO2, NO2, CO and O3) at 947 air quality grid monitoring points of 13 cities in the BTH region and controlling the meteorological factors, this paper takes the implementation of the Blue Sky Defense War (BSDW) policy as a quasi-natural experiment to examine the emission reduction effect of the policy in the BTH region by applying the difference-in-difference method. Results show that the policy leads to the significant reduction of the daily average concentration of PM2.5, PM10, SO2, O3 by −1.951 μg/m3, −3.872 μg/m3, −1.902 μg/m3, −7.882 μg/m3 and CO by −0.014 mg/m3, respectively. The results of the robustness test support the aforementioned conclusions. However, this paper finds that the concentration of NO2 increases significantly (1.865 μg/m3). In winter heating seasons, the concentration of SO2, CO and O3 decrease but PM2.5, PM10 and NO2 increase significantly. Besides, resource intensive cities, non-key environmental protection cities and cities in the north of the region have great potential for air pollutant emission reduction. Finally, policy suggestions are recommended; these include setting specific goals at the city level, incorporating more cities into the list of key environmental protection cities, refining the concrete indicators of domestic solid fuel, and encouraging and enforcing clean heating diffusion.

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“…To establish the effect of dispersion of pollutants the study used the HYSPLIT 4 model through the backward trajectories. The HYSPLIT makes assessments of air parcel trajectories based on Langrangian models [13] to identify sources, pathways of pollutants and transportation within the atmosphere over time [ 22 , 25 , 33 ]. It makes use of moving frames for calculating advection and diffusion [31] .…”

Section: Methodsmentioning

confidence: 99%

State of ambient air quality in a low-income urban settlement of South Africa

et al. 2022

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Spatiotemporal variability of tropospheric NO2 over four megacities in Southern Africa: Implications for transboundary regional air pollution

Cited by 10 publications

References 40 publications

Total column ozone (O 3 ) and nitrogen dioxide (NO 2 ) via satellite and their relationship with the burned area and climatic data in biomes of Central-West Brazil

Total column ozone (O 3 ) and nitrogen dioxide (NO 2 ) via satellite and their relationship with the burned area and climatic data in biomes of Central-West Brazil

Does the “Blue Sky Defense War Policy” Paint the Sky Blue?—A Case Study of Beijing–Tianjin–Hebei Region, China

State of ambient air quality in a low-income urban settlement of South Africa

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