Sulfur dioxide (SO2) and nitrogen dioxide (NO2) are some of the air pollutants in industrial and urban areas. These are the most prevalent inorganic pollutants that are a serious risk to public health in populated areas. However, Lephalale, Polokwane and Steelpoort have not received enough attention to date. Therefore, this study investigated seasonal levels of NO2 and SO2 concentrations using passive sampling during summer, winter, autumn and spring of 2021. The sampling was done the first seven days of the month. The relationship of inorganic pollutants with meteorological factors was performed statistically using multiple linear regression model. Lephalale exhibited the highest NO2 concentration, 1.74 μg/m3, in spring. Whereas Polokwane and Steelpoort peaked at 1.57 μg/m3 and 0.84 μg/m3 in winter, respectively. The concentrations of SO2 were higher in winter than in other seasons in all areas. The multiple linear regression models showed that NO2 and SO2 dispersion was influenced by meteorological parameters such as temperature, wind speed and relative humidity. In Polokwane and Steelpoort, NO2 and SO2 concentrations are inversely correlated to temperature and relative humidity. Similarly, NO2 concentrations are inversely correlated, while SO2 concentrations are directly correlated to both temperature and relative humidity in Lephalale. Wind speed had positive and inverse correlations to the concentrations of both air pollutants. The SO2 and NO2 concentrations did not exceed the annual average of 50 μg/m3 and 94 μg/m3 as set by National Ambient Air Quality Standards and World Health Organization. However, it is important to keep pollution concentrations of SO2 and NO2 to relatively safe for humans and the environment in the studied areas.
References
[1]
Alolayan, M.A., Almutairi, A., Aladwani, S.M. and Alkhamees, S. (2023) Investigating Major Sources of Air Pollution and Improving Spatiotemporal Forecast Accuracy Using Supervised Machine Learning and a Proxy. JournalofEngineeringResearch, 11, 87-93. https://doi.org/10.1016/j.jer.2023.100126
[2]
Bikis, A. (2023) Urban Air Pollution and Greenness in Relation to Public Health. JournalofEnvironmentalandPublicHealth, 2023, Article 8516622. https://doi.org/10.1155/2023/8516622
[3]
Duffney, P.F., Stanek, L.W. and Brown, J.S. (2024) Air Pollution: Sources, Regulation, and Health Effects. In: Wexler, P., Ed., EncyclopediaofToxicology, Academic Press, 215-228. https://doi.org/10.1016/b978-0-12-824315-2.00754-5
[4]
Garland, R., Naidoo, M., Sibiya, B. and Oosthuizen, R. (2017) Air Quality Indicators from the Environmental Performance Index: Potential Use and Limitations in South Africa. CleanAirJournal, 27, 33-41. https://doi.org/10.17159/2410-972x/2017/v27n1a8
[5]
Bonjour, S., Adair-Rohani, H., Wolf, J., Bruce, N.G., Mehta, S., Prüss-Ustün, A., etal. (2013) Solid Fuel Use for Household Cooking: Country and Regional Estimates for 1980-2010. EnvironmentalHealthPerspectives, 121, 784-790. https://doi.org/10.1289/ehp.1205987
[6]
Röllin, H. (2017) Evidence for Health Effects of Early Life Exposure to Indoor Air Pollutants: What We Know and What Can Be Done. CleanAirJournal, 27, 2-3. https://doi.org/10.17159/2410-972x/2017/v27n1a1
[7]
Agarwal, R. and Aggarwal, S.G. (2023) A Year-Round Study of Ambient Gaseous Pollutants, Their Atmospheric Chemistry and Role in Secondary Particle Formation at an Urban Site in Delhi. AtmosphericEnvironment, 295, Article 119557. https://doi.org/10.1016/j.atmosenv.2022.119557
[8]
WHO (2019) Air Pollution. World Health Organization.
[9]
Çapraz, Ö., Deniz, A. and Doğan, N. (2017) Effects of Air Pollution on Respiratory Hospital Admissions in İstanbul, Türkiye, 2013 to 2015. Chemosphere, 181, 544-550. https://doi.org/10.1016/j.chemosphere.2017.04.105
[10]
Hossain, M.S., Frey, H.C., Louie, P.K.K. and Lau, A.K.H. (2021) Combined Effects of Increased O3 and Reduced NO2 Concentrations on Short-Term Air Pollution Health Risks in Hong Kong. EnvironmentalPollution, 270, Article 116280. https://doi.org/10.1016/j.envpol.2020.116280
[11]
Pretorius, I. (2015) The Impact of the South African Energy Crisis on Emissions. WITTransactionsonEcologyandtheEnvironment, 198, 255-264. https://doi.org/10.2495/air150211
[12]
Shezi, B. and Wright, C.Y. (2018) Household Air Pollution Exposure and Respiratory Health Outcomes: A Narrative Review Update of the South African Epidemiological Evidence. CleanAirJournal, 28, 43-56. https://doi.org/10.17159/2410-972x/2018/v28n1a11
[13]
Okello, N.O., Okello, T.W. and Zunckel, M. (2020) Changes in Health Risk Associated with Air Pollution and Policy Response Effectiveness, Richards Bay, South Africa. CleanAirJournal, 30, 1-10. https://doi.org/10.17159/caj/2020/30/1.8012
[14]
Joss, M.K., Eeftens, M., Gintowt, E., Kappeler, R. and Kunzli, N. (2017) Time to Harmonize National Ambient Air Quality Standards. International Journal of Public Health, 62, 453-462. https://doi.org/10.1007/s00038-017-0952-y
[15]
Pienaar, J.J., Beukes, J.P., Van Zyl, P.G., Lehmann, C.M.B. and Aherne, J. (2015) Passive Diffusion Sampling Devices for Monitoring Ambient Air Concentrations. ComprehensiveAnalyticalChemistry, 70, 13-52. https://doi.org/10.1016/bs.coac.2015.09.002
[16]
Department of Environmental Affairs (2016) Draft Strategy to Adress Air Pollution in Dense Low-Income Sttlements. Staatskoerant, No. 40088, 1008-1023.
[17]
Department of Environmental Affairs (2018/2019) Annual Report. https://www.gov.za/sites/default/files/gcis_document/201911/environmental-affairs-1819-anreport.pdf
[18]
Bird, T., Liebenberg-Enslin, H., Von Gruenewaldt, R., Modisamongwe, D., Thivhafu-ni, P. and Mphahlele, T. (2011) Developing an Air Quality Management Plan: Lessons from Limpopo. Limpopo Department of Economic Development, Environment and Tourism (LEDET).
[19]
Maciejczyk, P., Chen, L. and Thurston, G. (2021) The Role of Fossil Fuel Combustion Metals in PM2.5 Air Pollution Health Associations. Atmosphere, 12, Article 1086. https://doi.org/10.3390/atmos12091086
[20]
Dou, S., Xu, D. and Keenan, R.J. (2023) Effect of Income, Industry Structure and Environmental Regulation on the Ecological Impacts of Mining: An Analysis for Guangxi Province in China. JournalofCleanerProduction, 400, Article 136654. https://doi.org/10.1016/j.jclepro.2023.136654
[21]
Quarm, J.A., Anning, A.K., Fei-Baffoe, B., Siaw, V.F. and Amuah, E.E.Y. (2022) Perception of the Environmental, Socio-Economic and Health Impacts of Artisanal Gold Mining in the Amansie West District, Ghana. EnvironmentalChallenges, 9, Article 100653. https://doi.org/10.1016/j.envc.2022.100653
[22]
Arowosegbe, O.O., Röösli, M., Künzli, N., Saucy, A., Adebayo-Ojo, T.C., Schwartz, J., etal. (2022) Ensemble Averaging Using Remote Sensing Data to Model Spatiotemporal PM10 Concentrations in Sparsely Monitored South Africa. EnvironmentalPollution, 310, Article 119883. https://doi.org/10.1016/j.envpol.2022.119883
[23]
Swartz, J.-S., Van Zyl, P.G., Beukes, J.P., Labuschagne, C., Brunke, E.-G., Portafaix, T., etal. (2020) Twenty-One Years of Passive Sampling Monitoring of SO2, NO2 and O3 at the Cape Point GAW Station, South Africa. AtmosphericEnvironment, 222, Article 117128. https://doi.org/10.1016/j.atmosenv.2019.117128
[24]
He, J., Xu, H., Balasubramanian, R., Chan, C.Y. and Wang, C. (2014) Comparison of NO2 and SO2 Measurements Using Different Passive Samplers in Tropical Environment. AerosolandAirQualityResearch, 14, 355-363. https://doi.org/10.4209/aaqr.2013.02.0055
[25]
Nakaishi, T. (2021) Developing Effective CO2 and SO2 Mitigation Strategy Based on Marginal Abatement Costs of Coal-Fired Power Plants in China. AppliedEnergy, 294, Article 116978. https://doi.org/10.1016/j.apenergy.2021.116978
[26]
Ai, H., Zhou, Z., Li, K. and Kang, Z. (2021) Impacts of the Desulfurization Price Subsidy Policy on SO2 Reduction: Evidence from China’s Coal-Fired Power Plants. EnergyPolicy, 157, Article 112477. https://doi.org/10.1016/j.enpol.2021.112477
[27]
Emami, F., Masiol, M. and Hopke, P.K. (2018) Air Pollution at Rochester, NY: Long-Term Trends and Multivariate Analysis of Upwind SO2 Source Impacts. Scienceof the TotalEnvironment, 612, 1506-1515. https://doi.org/10.1016/j.scitotenv.2017.09.026
[28]
Schatke, M., Meier, F., Schröder, B. and Weber, S. (2022) Impact of the 2020 COVID-19 Lockdown on NO2 and PM10 Concentrations in Berlin, Germany. AtmosphericEnvironment, 290, Article 119372. https://doi.org/10.1016/j.atmosenv.2022.119372
[29]
Ebrahimi, M. and Qaderi, F. (2021) Determination of the Most Effective Control Methods of SO2 Pollution in Tehran Based on Adaptive Neuro-Fuzzy Inference System. Chemosphere, 263, Article 128002. https://doi.org/10.1016/j.chemosphere.2020.128002
[30]
Adesina, J.A., Piketh, S.J., Burger, R.P. and Mkhatshwa, G. (2022) Assessment of Criteria Pollutants Contributions from Coal-Fired Plants and Domestic Solid Fuel Combustion at the South African Industrial Highveld. CleanerEngineeringandTechnology, 6, Article 100358. https://doi.org/10.1016/j.clet.2021.100358
