Spatial distribution and degree of heavy metal pollution in urban roadside dusts from Sanandaj, Iran

Document Type : Original Article


Department of Environmental Sciences, School of Natural Resources, University of Kurdistan, Iran


Industrial activities and high traffic density are the most important heavy metal pollution sources in urban areas. Roadside dust created by atmospheric deposition can be one of the best indicators for heavy metal contamination levels. The present study reports the spatial distribution patterns and degree of heavy metal pollution (Cd, Cr, Ni, Pb, Zn, and As) in 50 roadside dust samples from urban areas of Sanandaj, Iran. For this purpose, sampling points were selected on different roads including primary roads, high roads, and main roads. The geographic coordinates of sampling points were recorded by the Global Positioning System (GPS). The geoaccumulation index (Igeo) and integrated pollution index (IPI) were used to present the heavy metal contamination levels. The results obtained by the geoaccumulation index suggest that the roadside dust samples were moderately contaminated with Ni and Cr, moderately to heavily contaminated with Pb and Cd, and heavily to extremely contaminated with As and Zn. The assessment of the data shows that 92% of all roadside dust samples had moderate pollution levels with an IPI of higher than 2, indicating that roadside dust in Sanandaj County has moderately been polluted by anthropogenic emissions. In order to compare the heavy metal concentrations in different parts of Sanandaj County, each heavy metal contamination was interpolated in a geographical information system (GIS). Heavy metal distribution maps showed the different hotspots of each pollutant that indicated high traffic density and industrial centers as the important factors affecting their concentrations in Sanandaj County.   


  1. United Nations. World urbanization prospects: 2009 revisions. New York, NY: United Nations Department of Economic and Social Affairs; 2010.
  2. Madrid L, Diaz-Barrientos E, Madrid F. Distribution of heavy metal contents of urban soils in parks of Seville. Chemosphere 2002; 49(10): 1301-8.
  3. Imperato M, Adamo P, Naimo D, Arienzo M, Stanzione D, Violante P. Spatial distribution of heavy metals in urban soils of Naples city (Italy). Environ Pollut 2003; 124(2): 247-56.
  4. Li X, Poon Cs, Liu PS. Heavy metal contamination of urban soils and street dusts in Hong Kong. Applied Geochemistry 2001; 16(11?12): 1361-8.
  5. Maas S, Scheifler R, Benslama M, Crini N, Lucot E, Brahmia Z, et al. Spatial distribution of heavy metal concentrations in urban, suburban and agricultural soils in a Mediterranean city of Algeria. Environ Pollut 2010; 158(6): 2294-301.
  6. Apeagyei E, Bank MS, Spengler JD. Distribution of heavy metals in road dust along an urban-rural gradient in Massachusetts. Atmospheric Environment 2011; 45(13): 2310-23.
  7. Cambra K, Martinez T, Urzelai A, Alonso E. Risk Analysis of a Farm Area Near a Lead- and Cadmium-Contaminated Industrial Site. Journal of Soil Contamination 1999; 8(5): 527-40.
  8. Moreno T, Karanasiou A, Amato F, Lucarelli F, Nava S, Calzolai G, et al. Daily and hourly sourcing of metallic and mineral dust in urban air contaminated by traffic and coal-burning emissions. Atmospheric Environment 2013; 68: 33-44.
  9. Sinclair AH, Tolsma D. Associations and lags between air pollution and acute respiratory visits in an ambulatory care setting: 25-month results from the aerosol research and inhalation epidemiological study. J Air Waste Manag Assoc 2004; 54(9): 1212-8.
  10. Adriano DC. Trace Elements in Terrestrial Environments: Biogeochemistry, Bioavailability, and Risks of Metals. Berlin, Germany: Springer Science & Business Media; 2001.
  11. Sezgin N, Ozcan HK, Demir G, Nemlioglu S, Bayat C. Determination of heavy metal concentrations in street dusts in Istanbul E-5 highway. Environ Int 2004; 29(7): 979-85.
  12. De MiguelE, Iribarren I, Chacon E, Ordonez A, Charlesworth S. Risk-based evaluation of the exposure of children to trace elements in playgrounds in Madrid (Spain). Chemosphere 2007; 66(3): 505-13.
  13. Lim HS, Lee JS, Chon HT, Sager M. Heavy metal contamination and health risk assessment in the vicinity of the abandoned Songcheon Au-Ag mine in Korea. Journal of Geochemical Exploration 2008; 96(2-3): 223-30.
  14. Christoforidis A, Stamatis N. Heavy metal contamination in street dust and roadside soil along the major national road in Kavala's region, Greece. Geoderma 2009; 151(3-4): 257-63.
  15. Garcia R, Milla?n E. Assessment of Cd, Pb and Zn contamination in roadside soils and grasses from Gipuzkoa (Spain). Chemosphere 1998; 37(8): 1615-25.
  16. Wei B, Jiang F, Li X, Mu S. Spatial distribution and contamination assessment of heavy metals in urban road dusts from Urumqi, NW China. Microchemical Journal 2009; 93(2): 147-52.
  17. Bretzel F, Benvenuti S, Pistelli L. Metal contamination in urban street sediment in Pisa (Italy) can affect the production of antioxidant metabolites in Taraxacum officinale Weber. Environ Sci Pollut Res Int 2014; 21(3): 2325-33.
  18. Liu E, Yan T, Birch G, Zhu Y. Pollution and health risk of potentially toxic metals in urban road dust in Nanjing, a mega-city of China. Sci Total Environ 2014; 476-477: 522-31.
  19. Banerjee AD. Heavy metal levels and solid phase speciation in street dusts of Delhi, India. Environ Pollut 2003; 123(1): 95-105.
  20. Duzgoren-Aydin NS, Wong CS, Aydin A, Song Z, You M, Li XD. Heavy metal contamination and distribution in the urban environment of Guangzhou, SE China. Environ Geochem Health 2006; 28(4): 375-91.
  21. Amato F, Pandolfi M, Viana M, Querol X, Alastuey A, Moreno T. Spatial and chemical patterns of PM10 in road dust deposited in urban environment. Atmospheric Environment 2009; 43(9): 1650-9.
  22. Amanollahi J, Kaboodvandpour S, Abdullah AM, Rashidi P. Effect of the influence of heat and moisture changes of desert area around the Euphrates on the recent dust storms in Iran using Landsat satellite images processing. International journal of physical sciences 2012; 7(5): 827-30.
  23. Bourlinos AB, Simopoulos A, Boukos N, Petridis D. Magnetic Modification of the External Surfaces in the MCM-41 Porous Silica:? Synthesis, Characterization, and Functionalization. J Phys Chem B 2001; 105(31): 7432-37.
  24. United state Environmental Protection Agency. Acid digestion of sediments sludges and soils [Online]. [cited1996]; Available from: URL:
  26. Muller G. Index of geoaccumulation in sediments of the Rhine river. Geol J 1969; 2(3): 108-18.
  27. Ji Y, Feng Y, Wu J, Zhu T, Bai Z, Duan C. Using geoaccumulation index to study source profiles of soil dust in China. J Environ Sci (China) 2008; 20(5): 571-8.
  28. Chen TB, Zheng YM, Lei M, Huang ZC, Wu HT, Chen H, et al. Assessment of heavy metal pollution in surface soils of urban parks in Beijing, China. Chemosphere 2005; 60(4): 542-51.
  29. Wei B, Yang L. A review of heavy metal contaminations in urban soils, urban road dusts and agricultural soils from China. Microchemical Journal 2010; 94(2): 99-107.
  30. Cao S, Duan X, Zhao X, Ma J, Dong T, Huang N, et al. Health risks from the exposure of children to As, Se, Pb and other heavy metals near the largest coking plant in China. Sci Total Environ 2014; 472: 1001-9.
  31. Li Y, Wang YB, Gou X, Su YB, Wang G. Risk assessment of heavy metals in soils and vegetables around non-ferrous metals mining and smelting sites, Baiyin, China. J Environ Sci (China) 2006; 18(6): 1124-34.
  32. Sharma RK, Agrawal M, Marshall FM. Heavy metal (Cu, Zn, Cd and Pb) contamination of vegetables in urban India: a case study in Varanasi. Environ Pollut 2008; 154(2): 254-63.
  33. Zeng Xb, Li Lf, Mei Xr. Heavy Metal Content in Chinese Vegetable Plantation Land Soils and Related Source Analysis. Agricultural Sciences in China 2008; 7(9): 1115-26.
  34. Song B, Lei M, Chen T, Zheng Y, Xie Y, Li X, et al. Assessing the health risk of heavy metals in vegetables to the general population in Beijing, China. J Environ Sci (China) 2009; 21(12): 1702-9.