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Urban Air Pollution and Health in Developing Countries

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Air Pollution and Health Effects

Part of the book series: Molecular and Integrative Toxicology ((MOLECUL))

Abstract

The rapid economic development occurring in developing countries in recent decades has been accompanied with increasingly worsened air quality. In recent years, severe air pollution episodes have occurred frequently in the cities of some developing countries. The goal of this chapter is to describe outdoor air pollution issues with a focus on urban areas in developing countries. Topics include global air pollution trends, differences in emissions and concentrations of key air pollutants in different regions, emission sources disproportionately affecting developing countries, estimating disease burden in developing countries, and recommendations based on historical successes and lessons from developed countries.

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References

  • Ahmad SS, Aziz N (2013) Spatial and temporal analysis of ground level ozone and nitrogen dioxide concentration across the twin cities of Pakistan. Environ Monit Assess 185(4):3133–3147

    Article  CAS  PubMed  Google Scholar 

  • Amegah AK, Jaakkola JJ, Quansah R, Norgbe GK, Dzodzomenyo M (2012) Cooking fuel choices and garbage burning practices as determinants of birth weight: a cross-sectional study in Accra Ghana. Environ Health 11:78

    Article  PubMed Central  PubMed  Google Scholar 

  • Anderson HR, Atkinson R, Balbus J, Brauer M, Chapman R, Chowdhury Z, Cohen A, Demerjian KL, Ebi K, Favarato G, Greenbaum DS, Mehta S, North T, O’Keefe RM, Pandey KD, Pope CA III, Smith KR, Speizer F, Walsh M, Zhang J (2010) Outdoor air pollution and health in the developing countries of Asia: a comprehensive review. Health Effects Institute, Boston

    Google Scholar 

  • Ashworth DC, Fuller GW, Toledano MB, Font A, Elliott P, Hansell AL, de Hoogh K (2013) Comparative assessment of particulate air pollution exposure from municipal solid waste incinerator emissions. J Environ Public Health 2013:560342

    Article  PubMed Central  PubMed  Google Scholar 

  • Barletta B, Meinardi S, Simpson IJ, Khwaja HA, Blake DR, Rowland FS (2002) Mixing ratios of volatile organic compounds (VOCs) in the atmosphere of Karachi Pakistan. Atmos Environ 36(21):3429–3443

    Article  CAS  Google Scholar 

  • Blumberg KO, Walsh MP, Pera C (2003) Low-sulfur gasoline & diesel: the key to lower vehicle emissions. Available online [April 24] at: http://www.theicct.org/documents/Low-Sulfur_Exec_Summ_ICCT_2003.pdf

  • Board, N.C.R.P (2013) Draft revised regional plan 2021: national capital region. Ministry of Urban Development, Government of India, New Delhi

    Google Scholar 

  • CAI-Asia (2010) Air quality in Asia: status and trends 2010 edition. Clean Air Initiative for Asian Cities Center, Pasig City

    Google Scholar 

  • Chen WY, Xu RN (2010) Clean coal technology development in China. Energy Policy 38(5):2123–2130

    Article  Google Scholar 

  • Chen R, Kan H, Chen B, Huang W, Bai Z, Song G, Pan G, Group CC (2012) Association of particulate air pollution with daily mortality: the China Air Pollution and Health Effects Study. Am J Epidemiol 175(11):1173–1181

    Article  PubMed  Google Scholar 

  • Chung K (2013) TEL for MOGAS manufacture in China – LEAD project final report. The Lead Education and Abatement Design Group, Inc

    Google Scholar 

  • Commission E (2014) Large combustion plants directive. Available from: http://ec.europa.eu/environment/air/pollutants/stationary/lcp/legislation.htm. 4 Nov 2014

  • EEA (2010) Change in CO emissions 1990–2010 (EEA member countries). Available from: http://www.eea.europa.eu/data-and-maps/figures/change-in-co-emissions-1

  • EPB-Beijing (2013) 2012北京市环境状况剬报 2012 Beijingshi Huanjing Zhuangkuang Gongbao [Beijing environmental statement 2012]. Beijing Environmental Protection Bureau

    Google Scholar 

  • EPB-Shanghai (2013) 2012上海市环境状况剬报 2012 Shanghaishi Huanjing Zhuangkuang Gongbao [Shanghai environmental bulletin 2012]. Shanghai Environmental Protection Bureau

    Google Scholar 

  • Graber LK, Asher D, Anandaraja N, Bopp RF, Merrill K, Cullen MR, Luboga S, Trasande L (2010) Childhood lead exposure after the phaseout of leaded gasoline: an ecological study of school-age children in Kampala, Uganda. Environ Health Perspect 118(6):884–889

    Article  PubMed Central  CAS  PubMed  Google Scholar 

  • Grebot B, Hill J, Lee J, Scarborough T (2012) Analysis and summary of the Member States’ emission inventories 2007–2009 and related information under the LCP Directive (2001/80/EC): final report. European Commission

    Google Scholar 

  • Guttikunda SK (2009) Photochemistry of air pollution in Delhi, India: a monitoring based analysis, in SIM-air working paper series: 25–2009. Simple Interactive Models for Better Air Quality

    Google Scholar 

  • Guttikunda SK, Kopakka RV, Dasari P, Gertler AW (2013) Receptor model-based source apportionment of particulate pollution in Hyderabad, India. Environ Monit Assess 185(7):5585–5593

    Article  CAS  PubMed  Google Scholar 

  • Hasunuma H, Ishimaru Y, Yoda Y, Shima M (2014) Decline of ambient air pollution levels due to measures to control automobile emissions and effects on the prevalence of respiratory and allergic disorders among children in Japan. Environ Res 131:111–118

    Article  CAS  PubMed  Google Scholar 

  • He K, Wang S, Zhang J (2009) Blood lead levels of children and its trend in China. Sci Total Environ 407(13):3986–3993

    Article  CAS  PubMed  Google Scholar 

  • He H, Wang Y, Ma Q, Ma J, Chu B, Ji D, Tang G, Liu C, Zhang H, Hao J (2014) Mineral dust and NOx promote the conversion of SO2 to sulfate in heavy pollution days. Sci Rep 4:4172

    PubMed Central  PubMed  Google Scholar 

  • Henderson V (2002) Urbanization in developing countries. World Bank Res Obs 17:89–112

    Article  Google Scholar 

  • Heritage, D.o.t.E.a. (2005) Lead (Pb): air quality fact sheet

    Google Scholar 

  • Hodzic A, Wiedinmyer C, Salcedo D, Jimenez JL (2012) Impact of trash burning on air quality in Mexico City. Environ Sci Technol 46(9):4950–4957

    Article  CAS  PubMed  Google Scholar 

  • Huang K, Zhuang G, Lin Y, Fu JS, Wang Q, Liu T, Zhang R, Jiang Y, Deng C, Fu Q, Hsu NC, Cao B (2012a) Typical types and formation mechanisms of haze in an Eastern Asia megacity Shanghai. Atmos Chem Phys 12(1):105–124

    Article  Google Scholar 

  • Huang W, Wang G, Lu SE, Kipen H, Wang Y, Hu M, Lin W, Rich D, Ohman-Strickland P, Diehl SR, Zhu P, Tong J, Gong J, Zhu T, Zhang J (2012b) Inflammatory and oxidative stress responses of healthy young adults to changes in air quality during the Beijing Olympics. Am J Respir Crit Care Med 186(11):1150–1159

    Article  PubMed Central  CAS  PubMed  Google Scholar 

  • Hwang SS, Kang S, Lee JY, Lee JS, Kim HJ, Han SK, Yim JJ (2014) Impact of outdoor air pollution on the incidence of tuberculosis in the Seoul metropolitan area South Korea. Korean J Intern Med 29(2):183–190

    Article  PubMed Central  CAS  PubMed  Google Scholar 

  • Jones RL, Homa DM, Meyer PA, Brody DJ, Caldwell KL, Pirkle JL, Brown MJ (2009) Trends in blood lead levels and blood lead testing among US children aged 1 to 5 years, 1988–2004. Pediatrics 123(3):e376–e385

    Article  PubMed  Google Scholar 

  • Karademir A, Korucu MK (2013) Assessment of emissions and removal of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs) at start-up periods in a hazardous waste incinerator. J Air Waste Manag Assoc 63(7):788–795

    Article  CAS  PubMed  Google Scholar 

  • Klimont Z, Smith SJ, Cofala J (2013) The last decade of global anthropogenic sulfur dioxide: 2000–2011 emissions. Environ Res Lett 8(1):1–6

    Google Scholar 

  • Levy JI, Hammitt JK, Spengler JD (2000) Estimating the mortality impacts of particulate matter: what can be learned from between-study variability? Environ Health Perspect 108(2):109–117

    Article  PubMed Central  CAS  PubMed  Google Scholar 

  • Lim SS, Vos T, Flaxman AD, Danaei G, Shibuya K, Adair-Rohani H, Amann M, Anderson HR, Andrews KG, Aryee M, Atkinson C, Bacchus LJ, Bahalim AN, Balakrishnan K, Balmes J, Barker-Collo S, Baxter A, Bell ML, Blore JD, Blyth F, Bonner C, Borges G, Bourne R, Boussinesq M, Brauer M, Brooks P, Bruce NG, Brunekreef B, Bryan-Hancock C, Bucello C, Buchbinder R, Bull F, Burnett RT, Byers TE, Calabria B, Carapetis J, Carnahan E, Chafe Z, Charlson F, Chen H, Chen JS, Cheng AT, Child JC, Cohen A, Colson KE, Cowie BC, Darby S, Darling S, Davis A, Degenhardt L, Dentener F, Des Jarlais DC, Devries K, Dherani M, Ding EL, Dorsey ER, Driscoll T, Edmond K, Ali SE, Engell RE, Erwin PJ, Fahimi S, Falder G, Farzadfar F, Ferrari A, Finucane MM, Flaxman S, Fowkes FG, Freedman G, Freeman MK, Gakidou E, Ghosh S, Giovannucci E, Gmel G, Graham K, Grainger R, Grant B, Gunnell D, Gutierrez HR, Hall W, Hoek HW, Hogan A, Hosgood HD, Hoy D, Hu H, Hubbell BJ, Hutchings SJ, Ibeanusi SE, Jacklyn GL, Jasrasaria R, Jonas JB, Kan H, Kanis JA, Kassebaum N, Kawakami N, Khang YH, Khatibzadeh S, Khoo JP, Kok C, Laden F, Lalloo R, Lan Q, Lathlean T, Leasher JL, Leigh J, Li Y, Lin JK, Lipshultz SE, London S, Lozano R, Lu Y, Mak J, Malekzadeh R, Mallinger L, Marcenes W, March L, Marks R, Martin R, McGale P, McGrath J, Mehta S, Mensah GA, Merriman TR, Micha R, Michaud C, Mishra V, Mohd Hanafiah K, Mokdad AA, Morawska L, Mozaffarian D, Murphy T, Naghavi M, Neal B, Nelson PK, Nolla JM, Norman R, Olives C, Omer SB, Orchard J, Osborne R, Ostro B, Page A, Pandey KD, Parry CD, Passmore E, Patra J, Pearce N, Pelizzari PM, Petzold M, Phillips MR, Pope D, Pope CA, Powles J, Rao M, Razavi H, Rehfuess EA, Rehm JT, Ritz B, Rivara FP, Roberts T, Robinson C, Rodriguez-Portales JA, Romieu I, Room R, Rosenfeld LC, Roy A, Rushton L, Salomon JA, Sampson U, Sanchez-Riera L, Sanman E, Sapkota A, Seedat S, Shi P, Shield K, Shivakoti R, Singh GM, Sleet DA, Smith E, Smith KR, Stapelberg NJ, Steenland K, Stockl H, Stovner LJ, Straif K, Straney L, Thurston GD, Tran JH, Van Dingenen R, van Donkelaar A, Veerman JL, Vijayakumar L, Weintraub R, Weissman MM, White RA, Whiteford H, Wiersma ST, Wilkinson JD, Williams HC, Williams W, Wilson N, Woolf AD, Yip P, Zielinski JM, Lopez AD, Murray CJ, Ezzati M, AlMazroa MA, Memish ZA (2012) A comparative risk assessment of burden of disease and injury attributable to 67 risk factors and risk factor clusters in 21 regions, 1990–2010: a systematic analysis for the Global Burden of Disease Study 2010. Lancet 380(9859):2224–2260

    Article  PubMed Central  PubMed  Google Scholar 

  • Ma J, Gu B, He J, Shen S, Liu J, Sun Z, Yan Y, Yi Z, Lu X, Guo Y, Chang Z, Wang J, Song G, He W, Chen J, Xi T (2014) Blue sky roadmap report II: real-time disclosure begins. The Institute of Public and Environmental Affairs, Renmin University of China Institute of Environmental Policy and Planning, Society of Entrepreneurs and Ecology, Friends of Nature, Envirofriends, and Nature University Beijing, PRC

    Google Scholar 

  • Mathee A, Rollin H, von Schirnding Y, Levin J, Naik I (2006) Reductions in blood lead levels among school children following the introduction of unleaded petrol in South Africa. Environ Res 100(3):319–322

    Article  CAS  PubMed  Google Scholar 

  • MEP (2013a) 2012年中国环境状况剬报:大气环境 2012 Nian Zhongguo Huanjing Zhuangkuang Gongbao: Daqi Huanjing [2012 Chinese environmental condition report: air environment]. Available from: http://jcs.mep.gov.cn/hjzl/zkgb/2012zkgb/201306/t20130606_253402.htm. 6 June 2013

  • MEP (2013b) 2012年环境统计年报:废气 2012 Nian Huanjing Tongji Nianbao: Feiqi [2012 annual environment statistical report: air emissions]. Ministry of Environmental Protection, People’s Republic of China

    Google Scholar 

  • NEERI (2010) Air quality assessment, emissions inventory and source apportionment studies: Mumbai. National Environmental Engineering Research Institute, New Delhi

    Google Scholar 

  • Olajire AA, Azeez L, Oluyemi EA (2011) Exposure to hazardous air pollutants along Oba Akran road, Lagos-Nigeria. Chemosphere 84(8):1044–1051

    Article  CAS  PubMed  Google Scholar 

  • PAHO (2005) An assessment of health effects of ambient air pollution in Latin America and the Caribbean. Pan American Health Organization (PAHO), Santiago

    Google Scholar 

  • Ponka A, Salminen E, Ahonen S (1993) Lead in the ambient air and blood specimens of children in Helsinki. Sci Total Environ 138(1–3):301–308

    Article  CAS  PubMed  Google Scholar 

  • Pope CA, Ezzati M, Dockery DW (2009) Fine-particulate air pollution and life expectancy in the United States. N Engl J Med 360(4):376–386

    Article  PubMed Central  CAS  PubMed  Google Scholar 

  • Programme., P.f.C.F.a.V.U.N.E. (2014) Diesel fuel sulfur levels: global status April 2014. Global Clean Fuels and Vehicles Database

    Google Scholar 

  • Rich DQ, Kipen HM, Huang W, Wang G, Wang Y, Zhu P, Ohman-Strickland P, Hu M, Philipp C, Diehl SR, Lu SE, Tong J, Gong J, Thomas D, Zhu T, Zhang JJ (2012) Association between changes in air pollution levels during the Beijing Olympics and biomarkers of inflammation and thrombosis in healthy young adults. JAMA 307(19):2068–2078

    Article  PubMed Central  CAS  PubMed  Google Scholar 

  • Rich DQ, Ozkaynak H, Crooks J, Baxter L, Burke J, Ohman-Strickland P, Thevenet-Morrison K, Kipen HM, Zhang J, Kostis JB, Lunden M, Hodas N, Turpin BJ (2013) The triggering of myocardial infarction by fine particles is enhanced when particles are enriched in secondary species. Environ Sci Technol 47(16):9414–9423

    Article  CAS  PubMed  Google Scholar 

  • Romieu I, Gouveia N, Cifuentes LA, de Leon AP, Junger W, Vera J, Strappa V, Hurtado-Diaz M, Miranda-Soberanis V, Rojas-Bracho L, Carbajal-Arroyo L, Tzintzun-Cervantes G, H.E.I.H.R. Committee (2012) Multicity study of air pollution and mortality in Latin America (the ESCALA study). Res Rep Health Eff Inst 171:5–86

    CAS  PubMed  Google Scholar 

  • Rooney MS, Arku RE, Dionisio KL, Paciorek C, Friedman AB, Carmichael H, Zhou Z, Hughes AF, Vallarino J, Agyei-Mensah S, Spengler JD, Ezzati M (2012) Spatial and temporal patterns of particulate matter sources and pollution in four communities in Accra, Ghana. Sci Total Environ 435–436:107–114

    Article  PubMed  Google Scholar 

  • Roy A, Hu W, Wei F, Korn L, Chapman RS, Zhang JJ (2012) Ambient particulate matter and lung function growth in Chinese children. Epidemiology 23(3):464–472

    Article  PubMed Central  PubMed  Google Scholar 

  • Sabatini L, Pianetti A, Cecchetti G, Bruner A, Citterio B, Barbieri F, Bruscolini F (2013) Chemical and microbiological monitoring of air in two waste incineration plants. Ig Sanita Pubbl 69(1):13–37

    PubMed  Google Scholar 

  • Saini R, Masih A, Satsangi GS, Taneja A (2005) Surface levels of ozone and its precursor NO2 during winter season at urban and rural sites of a semi arid region in India. In: The atmospheric sciences and air quality conference. American Meteorological Society, San Francisco

    Google Scholar 

  • Schuetzle D, Siegl WO, Jensen TE, Dearth MA, Kaiser EW, Gorse R, Kreucher W, Kulik E (1994) The relationship between gasoline composition and vehicle hydrocarbon emissions: a review of current studies and future research needs. Environ Health Perspect 102(Suppl 4):3

    Article  PubMed Central  CAS  PubMed  Google Scholar 

  • Schwartz J (2004) The effects of particulate air pollution on daily deaths: a multi-city case crossover analysis. Occup Environ Med 61(12):956–961

    Article  PubMed Central  CAS  PubMed  Google Scholar 

  • Simoneit BRT, Medeiros PM, Didyk BM (2005) Combustion products of plastics as indicators for refuse burning in the atmosphere. Environ Sci Technol 39(18):6961–6970

    Article  CAS  PubMed  Google Scholar 

  • Stieb DM, Judek S, Burnett RT (2002) Meta-analysis of time-series studies of air pollution and mortality: effects of gases and particles and the influence of cause of death, age, and season. J Air Waste Manag Assoc 52(4):470–484

    Article  PubMed  Google Scholar 

  • Truex TJ (1999) Interaction of sulfur with automotive catalysts and the impact on vehicle emissions – a review. Proceedings of the society of automotive engineers, SAE Paper 1999-01-1543, Detroit

    Google Scholar 

  • Tuakuila J, Kabamba M, Mata H, Mata G (2013a) Blood lead levels in children after phase-out of leaded gasoline in Kinshasa, the capital of Democratic Republic of Congo (DRC). Arch Public Health 71(1):5

    Article  PubMed Central  PubMed  Google Scholar 

  • Tuakuila J, Lison D, Mbuyi F, Haufroid V, Hoet P (2013b) Elevated blood lead levels and sources of exposure in the population of Kinshasa, the capital of the Democratic Republic of Congo. J Expo Sci Environ Epidemiol 23(1):81–87

    Article  CAS  PubMed  Google Scholar 

  • UNDESA (2011) On-line data: urban agglomerations, population of urban agglomerations with 750 000 or more in 2011. Available from: http://esa.un.org/unpd/wup/unup/index_panel2.html

  • UNEP (2010) Final review of scientific information on lead. United Nations Environment Programme. Chemicals Branch, DTIE, Geneva, Switzerland

    Google Scholar 

  • USEIA (2014) Short-term energy and summer fuels outlook. US Energy Information Administration, Washington, DC

    Google Scholar 

  • USEPA (2011) The benefits and costs of the Clean Air Act from 1990–2020. US Environmental Protection Agency, Washington, DC

    Google Scholar 

  • USEPA (2012) 2008 national emissions inventory, version 2. Technical support document. U.S. Environmental protection agency. Office of air quality planning and standards. Air quality assessment division. Emissions Inventory and Analysis Group, Research Triangle Park

    Google Scholar 

  • USEPA (2013a) Air trends: sulfur dioxide. Available from: http://www.epa.gov/air/airtrends/sulfur.html. 3 Sept 2013

  • USEPA (2013b) Air trends: nitrogen dioxide. Available from: http://www.epa.gov/airtrends/nitrogen.html. 3 Sept 2013

  • USEPA (2014a) Air emission sources: nitrogen oxides. Available from: http://www.epa.gov/cgi-bin/broker?_service=data&_debug=0&_program=dataprog.national_1.sas&polchoice=NOX 22 Apr 2014

  • USEPA (2014b) Air emission sources: carbon monoxide. Available from: http://www.epa.gov/cgi-bin/broker?_service=data&_debug=0&_program=dataprog.national_1.sas&polchoice=CO. 24 Apr 2014

  • USEPA (2014c) Air trends: air quality trends. Available from: http://www.epa.gov/airtrends/aqtrends.html. 21 Apr 2014

  • von Schneidemesser E, Monks PS, Plass-Duelmer C (2010) Global comparison of VOC and CO observations in urban areas. Atmos Environ 44(39):5053–5064

    Article  Google Scholar 

  • Wang X, Ding H, Ryan L, Xu X (1997) Association between air pollution and low birth weight: a community-based study. Environ Health Perspect 105(5):514

    Article  PubMed Central  CAS  PubMed  Google Scholar 

  • Wang S, Xing J, Zhao B, Jang C, Hao J (2014) Effectiveness of national air pollution control policies on the air quality in metropolitan areas of China. J Environ Sci (China) 26(1):13–22

    Article  CAS  Google Scholar 

  • WHO (2000) Air quality guidelines for Europe. In: WHO regional publications, European series, no. 91. World Health Organization Regional Office for Europe, Copenhagen

    Google Scholar 

  • WHO (2006) Air quality guidelines: global update 2005. Particulate matter, ozone, nitrogen dioxide, and sulfur dioxide. World Health Organization

    Google Scholar 

  • Zhang JJ, Hu W, Wei F, Wu G, Korn LR, Chapman RS (2002) Children’s respiratory morbidity prevalence in relation to air pollution in four Chinese cities. Environ Health Perspect 110(9):961–967

    Article  PubMed Central  CAS  PubMed  Google Scholar 

  • Zhao B, Wang SX, Liu H, Xu JY, Fu K, Klimont Z, Hao JM, He KB, Cofala J, Amann M (2013) NOx emissions in China: historical trends and future perspectives. Atmos Chem Phys 13(19):9869–9897

    Article  CAS  Google Scholar 

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Authors and Affiliations

  1. Nicholas School of the Environment & Duke Global Health Institute, Duke University, LSRC A309, 308 Research Drive, Durham, NC, 27708, USA

    Junfeng (Jim) Zhang Ph.D. & Drew Day B.A., B.S.

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  1. Junfeng (Jim) Zhang Ph.D.
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  2. Drew Day B.A., B.S.
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Correspondence to Junfeng (Jim) Zhang Ph.D. .

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Editors and Affiliations

  1. Division of Extramural Research and Training, National Institute of Environmental Health Sciences, Research Triangle Park, North Carolina, USA

    Srikanth S. Nadadur

  2. Department of Internal Medicine, Division of Pulmonary, Allergy, Critical Care, and Sleep Medicine, Ohio State University, Columbus, Ohio, USA

    John W. Hollingsworth

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Zhang, J.(., Day, D. (2015). Urban Air Pollution and Health in Developing Countries. In: Nadadur, S., Hollingsworth, J. (eds) Air Pollution and Health Effects. Molecular and Integrative Toxicology. Springer, London. https://doi.org/10.1007/978-1-4471-6669-6_13

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