Influence of Temperature and Relative Humidity on Air Pollution in Addis Ababa, Ethiopia

Mulu Fikeraddis (Department of Physics, Worabe University, Worabe, Ethiopia)
Lake Endeshaw (Department of Physics, Worabe University, Worabe, Ethiopia)

Article ID: 2286


In this paper we access the effects of two atmospheric variables (temperature and relative humidity) on two important pollutants in the atmosphere (Nitrogen oxides (NOx) and carbon monoxide (CO)) by using one year (2016) data of Addis Ababa. Temperature has impact on atmospheric mixing and cause for the reduction of NOx as temperature increases. There are positive correlation between temperature and CO concentration from January to April with (R2 = 0.69), negative correlation from May to August with (R2 = 0.92) and no correlation for the remaining months. NOx and CO have moderate positive and negative correlation with relative humidity during the months January-April (R2 = 0.294 for NOx and R2 = 0291 for CO) and in the months May-August are R2 = 0.97 and R2 = 0.15 for NOx and CO respectively. But there are no clear correlation between the NOx and CO with relative humidity from September-December. NOx concentrations during wet season was almost about twice that of the dry season, but no such difference was observed in the case of CO. The seasonal average air temperature in wet season is relatively lower than dry season. NOx exhibited positive and CO negative seasonal correlations with relative humidity.


Atmospheric pollutants; Carbon monoxide; Nitrogen oxides; Relative humidity; Temperature

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[1] Arlene, Fiore, Vaishali Naik, Eric, Leibensperger. Air Quality and Climate Connections. Journal of the Air & Waste Management Association, 2015, 65: 645- 685.

[2] Andreae M, Gelencser. Black carbon or brown carbon? The nature of light-absorbing carbonaceous aerosols. Atmos Chem Phys., 2006, 6: 3131-3148.

[3] Tressol M, Ordonez C, Zbinden R., et al. Air pollution during the 2003 European heat wave as seen by MOZAIC airliners. Atmos Chem Phys., 2008, 8(8): 2133-50.

[4] Bathmanaban S. Analysis of interpretation of pollutants emission from the heterogeneous traffic near an urban roadway. Atmospheric Pollution Research, 2010, 1: 184-194.

[5] Weaver CP, Cooter E, Gilliam R et al. A preliminary synthesis of modeled climate change impacts on U.S. regional ozone concentrations. Bull Am Meteorol Soc., 2009, 90(12): 1843-63.

[6] Ordonez C, Mathis H, Furger M, Henne S, Huglin C, Staehelin J, Prevot ASH. Changes of daily surface ozone maxima in Switzerland in all seasons from 1992 to 2002 and discussion of summer 2003. Atmos Chem Phys., 2005, 5(5): 1187-203.

[7] Vieno M, Dore AJ, Stevenson DS, Doherty R, et al. Modelling surface ozone during the 2003 heat-wave in the UK. Atmos Chem Phys., 2010, 10(16): 7963- 78.

[8] Aneja VP, Agarwal A, Roelle PA, Philips SB, Tong Q, Watkins N. Measurements and analysis of criteria pollutants in New Delhi, India. Environment International, 2008, 27: 35-42.

[9] Ravishankara AR, Dawson JP, Winner DA. New directions: Adapting air quality management to climate change: A must for planning. Atmos Environ., 2012, 50(0): 387-89.

[10] Dawson JP, Bloomer BJ, Winner DA, Weaver CP. Understanding the meteorological drivers of U.S. particulate matter concentrations in a changing climate. Bull Am Meteorol Soc., 2013, 95(4): 521-32.

[11] Geddes JA, Murphy JG, Wang DK. Long term changes in nitrogen oxides and volatile organic compounds in Toronto and the challenges facing local ozone control. Atmos Environ., 2009, 43: 3407-3415.

[12] Gong X, Kaulfus A, Nair U, Jaffe DA. Quantifying O3 Impacts in Urban Areas Due to Wildfires Using a Generalized Additive Mode. Environ Sci Technol., 2017, 51: 13216-13223.

[13] Olsen SC, Brasseur GP, Wuebbles DJ et al. Comparison of model estimates of the effects of aviation emissions on atmospheric ozone and methane. Geophys Res Lett., 2013, 40(22): 6004-9.

[14] Richter A. Nitrogen oxides in the troposphere - What have we learned from satellite measurements? Eur Phys J Conferences, 2009, 1: 149-156.

[15] Holmes CD, Tang Q, Prather MJ. Uncertainties in climate assessment for the case of aviation NO. Proc Natl Acad Sci USA, 2011, 108 (27): 10997-1002.

[16] Unger N. Global climate impact of civil aviation for standard and desulfurized jet fuel. Geophys Res Lett., 2011, 38(20): L20803.

[17] Koch D, Schulz M, Kinne S, et al. Evaluation of black carbon estimations in global aerosol models. Atmos Chem Phys., 2009, 9: 9001-9026. https://doi. org/10.5194/acp-9-9001-2009

[18] Mkoma SL, Maenhaut W, Chi X, Wang W, Raes N. Characterisation of PM10 atmospheric aerosols for the wet season 2005 at two sites in East Africa. Atmos Environ., 2009, 43: 631-639.

[19] van Vliet ED.S, Kinney PL. Impacts of roadway emissions on urban particulate matter concentrations in sub-Saharan Africa: new evidence from Nairobi, Kenya. Environ Res Lett., 2007, 2: 045028.

[20] Johansson C, Norman M, Burman L. Road traffic emission factors. Atmospheric Environment. 2009.

[21] Prinn RG, Weiss RF, Fraser PJ, et al. A history of chemically and radiatively important gases in air deduced from ALE/GAGE/AGAGE, J Geophys Res Atmos., 2000, 105: 17751-17792.

[22] Katsoulis BD. The relationship between synoptic, mesoscale and microscale meteorological parameters during poor air quality events in Athens, Greece. The Science of the Total Environment, 1996, 181: 13-24.

[23] Fry MM, Naik V, West JJ, et al. The influence of ozone precursor emissions from four world regions on tropospheric composition and radiative climate forcing. J Geophys Res., 2012, 117(D7): D07306.

[24] Fry MM, Schwarzkopf MD, Adelman Z, Naik V, Collins WJ, West JJ. Net radiative forcing and air quality responses to regional CO emission reductions. Atmos Chem Phys., 2013, 13(10): 5381-99.

[25] Fry MM, Schwarzkopf MD, Adelman Z, West JJ. Air quality and radiative forcing impacts of anthropogenic volatile organic compound emissions from ten world regions. Atmos Chem Phys., 2014, 14(2): 523- 35.

[26] Joss MK, Eeftens M, Gintowt E, Kappeler R, Künzli N. Time to harmonize national ambient air quality standards. International Journal of Public Health, 2017, 62(4): 453-462.

[27] Gatari MJ, Boman J. Black carbon and total carbon measurements at urban and rural sites in Kenya, East Africa. Atmos Environ., 2003, 37: 1149-1154.

[28] Yared W, Birhanu H. Assessment of the current air status of Addis Ababa (From September to January, 2016), Ethiopia. Int J Compr Res Biol Sci., 2018, 5(3): 7-15.

[29] Turalioglu FS, Nuhoglu A, Bayraktar H. Impacts of some meteorological parameters on SO2 and TSP concentrations in Erzurum, Turkey. Chemosphere, 2005, 59: 1633-1642.

[30] Elminir HK. Dependence of urban air pollutants on meteorology. The Science of the Total Environment, 2005, 350: 225-237

[31] Lawrence A, Malish A, Tane A. Indoor/outdoor relationships of carbon monoxide and oxides of nitrogen in domestic homes with roadside, urban and rural locations in a central Indian region. Indoor Air, 2011, 15 (2): 76-82

[32] Franke K. Nitrogen oxides in the troposphere. Atmos Chem Phys Disc., 2008, 8, 15997

[33] Hosseinibalam F, Hejazi A. Influence of Meteorological Parameters on Air Pollution in Isfahan. 2012 3rd International Conference on Biology, Environment and Chemistry IPCBEE, 2012, 46(2).

[34] Witz S, Moore AB. Effect of meteorology on the atmospheric concentrations of traffic-related pollutants at a Los Angeles site. JAPCA, 1981, 31: 1098-1101

[35] Jayamurugan R, Kumaravel B, Palanivelraja S, Chockalingam MP. Influence of Temperature, Relative Humidity and Seasonal Variability on Ambient Air Quality in a Coastal Urban Area. International Journal of Atmospheric Sciences, 2013(7).

[36] Seleshi Y, Zanke U. Recent Changes in Rainfall and Rainy Days in Ethiopia. Int. J. Climatol., 2004, 24: 973-983.

[37] Ocak S, Demircioğlu, N. Erzurum Ili Kasım 1995-Nisan 1996 Hava Kalitesi Profili. I.Ulusal Çevre Sorunları Sempozyumu, Ataturk Univ. Çevre Sorunları Araştırma Merkezi, Erzurum, 2002.

[38] Akkaya S, Pazarlıoglu, M. Ekonometri II. Erkam Yayınevi, İzmir, 2009.

[39] Ocak, S. Erzurum’da Hava Kirliliği, Değerlendirmesi ve Atmospheric Parameter lerle İlişkilendirilmesi, Yüksek Lisans Tezi, Atatürk University, Erzurum, 2007.

[40] NMA, E. National Meteorological Agency of the Federal Democratic Republic of Ethiopia, 2016.



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