References
  -  P. Tume, E. González, F. Reyes, J.P. Fuentes, N. Roca, J. Bech,
    G. Medina, Sources analysis and health risk assessment of
    trace elements in urban soils of Hualpen, Chile, Catena,
    175 (2019) 304–316. 
 
  -  G. Li, G.-X. Sun, Y. Ren, X.-S. Luo, Y.-G. Zhu, Urban soil and
    human health: a review, Eur. J. Soil Sci., 69 (2018) 196–215. 
 
  -  J.C. Duan, J.H. Tan, Atmospheric heavy metals and arsenic in
    China: situation, sources and control policies, Atmos. Environ.,
    74 (2013) 93–101. 
 
  -  M.S. Wang, Q. Han, C.L. Gui, J.L. Cao, Y.P. Liu, X.D. He, Y.C. He,
    Differences in the risk assessment of soil heavy metals between
    newly built and original parks in Jiaozuo, Henan Province,
    China, Sci. Total Environ., 676 (2019) 1–10. 
 
  -  E. Adamiec, E. Jarosz-Krzemińska, R. Wieszała, Heavy metals
    from non-exhaust vehicle emissions in urban and motorway
    road dusts, Environ. Monit. Assess., 188 (2016) 369. 
 
  -  Science Communication Unit, Science for Environment Policy
    IN-DEPTH Report: Soil Contamination: Impacts on Human
    Health, European Commission DG Environment, University of
    the West of England (UWE), Bristol, 2013. 
 
  -  X. Qing, Z. Yutong, L. Shenggao, Assessment of heavy metal
    pollution and human health risk in urban soils of steel industrial
    city (Anshan), Liaoning, Northeast China, Ecotoxicol. Environ.
    Saf., 120 (2015) 377–385. 
 
  -  C.L.S. Wiseman, F. Zereini, W. Püttmann, Metal and metalloid
    accumulation in cultivated urban soils: a medium-term study
    of trends in Toronto, Canada, Sci. Total Environ., 538 (2015)
    564–572. 
 
  -  N.S. Yuswir, S.M. Praveena, A.Z. Aris, S.N.S. Ismail, Z. Hashim,
    Health risk assessment of heavy metal in urban surface soil
    (Klang District, Malaysia), Bull. Environ. Contam. Toxicol.,
    95 (2015) 80–89. 
 
  -  B. Mugoša, D. Ðurović, M. Nedović-Vuković, S. Barjaktarović-Labović, M. Vrvić, Assessment of ecological risk of heavy metal
    contamination in coastal municipalities of Montenegro, Int. J.
    Environ. Res. Public Health, 13 (2016) 393. 
 
  -  A. Mohseni-Bandpei, S.D. Ashrafi, H. Kamani, A. Paseban,
    Contamination and ecological risk assessment of heavy metals
    in surface soils of Esfarayen City, Iran, Health Scope, 6 (2017)
    e39703. 
 
  -  I.V. Galitskaya, K. Rama Mohan, A. Keshav Krishna, G.I. Batrak,
    O.N. Eremina, V.S. Putilina, T.I. Yuganova, Assessment of soil
    and groundwater contamination by heavy metals and metalloids
    in Russian and Indian megacities, Procedia Earth Planet.
    Sci., 17 (2017) 674–677. 
 
  -  S.Y. Li, Z.M. Jia, Heavy metals in soils from a representative
    rapidly developing megacity (SW China): levels, source
    identification and apportionment, Catena, 163 (2018) 414–423. 
 
  -  M. Wang, R. Liu, W.P. Chen, C. Peng, B. Markert, Effects of
    urbanization on heavy metal accumulation in surface soils,
    Beijing, J. Environ. Sci., 64 (2018) 328–334. 
 
  -  I. Massas, D. Ioannou, D. Kalivas, D. Gasparatos, Distribution
    of heavy metals concentrations in soils around the International
    Athens Airport (Greece). An assessment on preliminary data,
    Bull. Geol. Soc. Greece, 50 (2016) 2231–2240. 
 
  -  N. Ozgul, I. Ozcan, I. Akmese, K. Uner, I. Bilgin, R. Korkmaz,
    U. Yıldırım, Z. Yıldız, O. Akdag, M. Tekin, Geology of the
    İstanbul City, Published by İstanbul Metropolitan Municipality,
    2011, p. 305. 
 
  -  N. Ozgul, Stratigraphy and some structural features of the
    İstanbul Palaeozoic, Turk. J. Earth Sci., 21 (2012) 817–866. 
 
  -  M. Barbieri, The importance of enrichment factor (EF) and
    geoaccumulation index (Igeo) to evaluate the soil contamination,
    J. Geol. Geophys., 5 (2016) 1–4. 
 
  -  I.A. Ololade, An assessment of heavy-metal contamination
    in soils within auto-mechanic workshops using enrichment
    and contamination factors with geoaccumulation indexes,
    J. Environ. Prot., 5 (2014) 970–982. 
 
  -  U. Aiman, A. Mahmood, S. Waheed, R.N. Malik, Enrichment,
    geo-accumulation and risk surveillance of toxic metals for
    different environmental compartments from Mehmood Booti
    dumping site, Lahore city, Pakistan, Chemosphere, 144 (2016)
    2229–2237. 
 
  -  J.L. Xu, B.B. Jing, K.X. Zhang, Y.C. Cui, D. Malkinson, D. Kopel,
    K. Song, L.J. Da, Heavy metal contamination of soil and treering
    in urban forest around highway in Shanghai, China, Hum.
    Ecol. Risk Assess., 23 (2017) 1745–1762. 
 
  -  Y.X. Jiang, S.H. Chao, J.W. Liu, Y. Yang, Y.J. Chen, A.C. Zhang,
    H.B. Cao, Source apportionment and health risk assessment
    of heavy metals in soil for a township in Jiangsu Province,
    China, Chemosphere, 168 (2017) 1658–1668. 
 
  -  L. Hakanson, An ecological risk index for aquatic pollutioncontrol
    - a sedimentological approach, Water Res., 14 (1980)
    975–1001. 
 
  -  S. Dehghani, F. Moore, B. Keshavarzi, A.H. Beverley, Health
    risk implications of potentially toxic metals in street dust and
    surface soil of Tehran, Iran, Ecotoxicol. Environ. Saf., 136 (2017)
    92–103. 
 
  -  D.C. Tomlinson, J.G. Wilson, C.R. Harris, D.W. Jeffrey, Problems
    in the assessment of heavy-metal levels in estuaries and the
    formation of a pollution index, Helgol. Wiss. Meeresunters,
    33 (1980) 566–575. 
 
  -  S. Jorfi, R. Maleki, N. Jaafarzadeh, M. Ahmadi, Pollution load
    index for heavy metals in Mian-Ab plain soil, Khuzestan, Iran,
    Data Brief, 15 (2017) 584–590. 
 
  -  A. Ozturk, C. Yarci, I.I. Ozyigit, Assessment of heavy metal
    pollution in Istanbul using plant (Celtis australis L.) and soil
    assays, Biotechnol. Biotechnol. Equip., 31 (2017) 948–954. 
 
  -  G. Yaylalı-Abanuz, Heavy metal contamination of surface soil
    around Gebze industrial area, Turkey, Microchem. J., 99 (2011)
    82–92. 
 
  -  D. Bingöl, S. Karayünlü Bozbaş, Ü. Ay, N. Uzgören, Chemometric
    evaluation of the heavy metal contents in surface soils
    from the Dilovası Region (Kocaeli/Turkey), Cumhuriyet Sci. J.,
    38 (2018) 23–33. 
 
  -  N. Balkaya, S. Guneysu, eds., Recycling and Reuse Approaches
    for Better Sustainability, Springer International Publishing AG,
    Part of Springer Nature, Cham, 2019, pp. 215–230. 
 
  -  E.E. Ozbas, H.K. Ozcan, N. Balkaya, G. Demir, Heavy metal
    amounts in soil and sediments of surface water sources in the
    industrial regions of Istanbul, J. Residuals Sci. Technol., 4 (2007)
    89–94. 
 
  -  A. Özkan, V. Özkan, S. Sungur, H. Birses, Heavy metal pollution
    around International Hatay Airport, Nat. Eng. Sci., 2 (2017)
    18–24. 
 
  -  O.A. Al-Khashman, R.A. Shawabkeh, Metal distribution in
    urban soil around steel industry beside Queen Alia Airport,
    Jordan, Environ. Geochem. Health, 31 (2009) 717–726. 
 
  -  I. Massas, D. Gasparatos, D. Ioannou, D. Kalivas, Signs for
    secondary buildup of heavy metals in soils at the periphery of
    Athens International Airport, Greece, Environ. Sci. Pollut. Res.,
    25 (2018) 658–671. 
 
  -  S. Ray, P.S. Khillare, K.H. Kim, The effect of aircraft traffic
    emissions on the soil surface contamination analysis around the
    International Airport in Delhi, India, Asian J. Atmos. Environ.,
    6 (2012) 118–126. 
 
  -  P.H. Rao, A.Y. Zhu, W. Yao, W.Q. Zhang, Y. Men, G.Y. Ding,
    Sources and risk assessment of metal contamination in soils at
    the international airport of Shanghai, China, Toxicol. Environ.
    Chem., 96 (2014) 1153–1161. 
 
  -  Methods for Inventories of Contaminated Sites, Swedish
    Environmental Protection Agency, Report 5053, 1st ed.,
    Stockholm, Sweden, 2002. Available at: http://www.naturvardsverket.
    se. 
 
  -  Canadian Environmental Quality Guidelines (CCME), Canadian
    Soil Quality Guidelines for the Protection of Environmental
    and Human Health. Canadian Council of Ministers of the
    Environment, Winnipeg, 2007. 
 
  -  VROM (Volkshuisvesting, RuimtelijkeOrdeningenMilieubeheer),
    Circular on Target Values and Intervention Values for Soil
    Remediation. Spatial Planning and Environment, Ministry
    of Housing, Spatial Planning and Environment, Netherlands,
    2000. 
 
  -  G. Tóth, T. Hermann, G. Szatmári, L. Pásztor, Maps of heavy
    metals in the soils of the European Union and proposed priority
    areas for detailed assessment, Sci. Total Environ., 565 (2016)
    1054–1062. 
 
  -  B.J. Alloway, Sources of Heavy Metals and Metalloids in
    Soils, B.J. Alloway, Ed., Heavy Metals in Soils: Trace Metals
    and Metalloids in Soils and their Bioavailability, Springer
    Science+Business Media, Dordrecht, 2013. 
 
  -  S.R. Taylor, S.M. McLennan, The geochemical evolution of
    the continental crust, Rev. Geophys., 33 (1995) 165–241. 
 
  -  R.L. Vander Wal, V.M. Bryg, C.-H. Huang, Aircraft engine
    particulate matter: macro- micro- and nanostructure by HRTEM
    and chemistry by XPS, Combust. Flame, 161 (2014) 602–611. 
 
  -  F. Amato, T. Moreno, M. Pandolfi, X. Querol, A. Alastuey,
    A. Delgado, M. Pedrero, N. Cots, Concentrations, sources and
    geochemistry of airborne particulate matter at a major European
    airport, J. Environ. Monit., 12 (2010) 854–862. 
 
  -  J. Zhang, C.L. Liu, Riverine composition and estuarine geochemistry
    of particulate metals in China—weathering features,
    anthropogenic impact and chemical fluxes, Estuarine Coastal
    Shelf Sci., 54 (2000) 1051–1070. 
 
  -  R. Rai, S. Sharma, D.B. Gurung, B.K. Sitaula, Heavy metal
    contamination in sediments from vehicle washing: a case study
    of Olarong Chhu Stream and Paa Chhu River, Bhutan, Int. J.
    Environ. Stud., 76 (2019) 66–83. 
 
  -  C.L. Ndiokwere, A study of heavy metal pollution from motor
    vehicle emissions and its effect on roadside soil, vegetation and
    crops in Nigeria, Environ. Pollut. Ser. B, 7 (1984) 35–42. 
 
  -  D.J. Smith, H. Shilley, Residential Car Washwater Monitoring
    Study, City of Federal Way, Public Works Department, Surface
    Water Management Division, Washington, 2009. 
 
  -  N.I. Ward, Multielement contamination of British motorway
    environments, Sci. Total Environ., 93 (1990) 393–401. 
 
  -  A. Thorpe, R.M. Harrison, Sources and properties of nonexhaust
    particulate matter from road traffic: a review, Sci. Total
    Environ., 400 (2008) 270–282. 
 
  -  T. Grigoratos, G. Martini, Brake wear particle emissions: a
    review, Environ. Sci. Pollut. Res., 22 (2015) 2491–2504 
 
  -  S. Rodrı́guez, X. Querol, A. Alastuey, M.-M. Viana, M. Alarcón,
    E. Mantilla, C.R. Ruiz, Comparative PM10–PM2.5 source
    contribution study at rural, urban and industrial sites during
    PM episodes in Eastern Spain, Sci. Total Environ., 328 (2004)
    95–113. 
 
  -  M.S. Atiemo, G.F. Ofosu, H. Kuranchie-Mensah, A.O. Tutu,
    N.D.M.L. Palm, S.A. Blankson, Contamination assessment of
    heavy metals in road dust from selected roads in Accra, Ghana,
    Res. J. Environ. Earth Sci., 3 (2011) 473–480. 
 
  -  G. Weckwerth, Verification of traffic emitted aerosol components
    in the ambient air of Cologne (Germany), Atmos.
	  Environ., 35 (2001) 5525–5536.