1. Angle, C.R., Marcu, A., Cheng, I.H. and McIntire, M.S. (1984). Omaha childhood blood lead and environmental lead: A linear total exposure model. Environmental Research, 35: 160-170. https://doi.org/10.1016/0013-9351(84)90123-3
2. Arslan, H. and Gizir, A.M. (2004).Monitoring of heavy metal pollution of traffic origin in Adana.Fresen.Environmental Bulletin, 13(4): 361-365.
3. Baralkiewicz, D. and Siepak, J. (1999). Chromium, nikel and cobalt in Environmental samples and eisting legal norms.Polish Journal of Environmental Studies, 8(4): 201-208.
4. Brown, H.S., Kasperton, R.E. and Raymond, S. (1999). Trace pollutants, In: the Earth as Transformed by Human Action. Cambridge, Cambridge University Press.
5. Chen , T.B., Zheng, Y.M., Lei, M., Huang, Z.C., Wu, H.T., Chen, H., Fan, K.K., Yu, K., Wu, X. and Tian, Q.Z. (2005). Assessment of heavy metal pollution in surface soils of urban parks in Beijing, China. Chemosphere, 60: 542–551. https://doi.org/10.1016/j.chemosphere.2004.12.072
6. Chen, T.B., Wong, J.W.C., Zhou, H.Y. and Wong, M.H. (1997). Assess-ment of trace metal distribution and contamination in surface soils of Hong Kong. Environmental Pollution. 96: 61–68. https://doi.org/10.1016/S0269-7491(97)00003-1
7. Choubey, V.M., Bartarya, S.K., Saini, N.K. and Ramola, R.C. (2001). Radon measurements in ground water of inter-montane Doon valley, outer Himalaya; effects of geohydrology and neotectonic activity. Environmental Geology, 40(3): 257-266. https://doi.org/10.1007/s002540000177
8. Faiz, Y., Tufail, M., Tayyeb, M., Chaudhry, M.M. and Siddique, N. (2009). Road dust pollution of Cd, Cu, Ni, Pband Zn along Islamabad Expressway, Pakistan. Microchemical Journal, 92: 186-192. https://doi.org/10.1016/j.microc.2009.03.009
9. Grigalaviciene, I., Rutkoviene, V. and Marozas, V. (2005).The accumulation of heavy metals Pb, Cu and Cd at road side forest soil. Polish Journal of Environmental Studies, 14(1): 109-115.
10. Joshi, P.C. and Swami, A. (2009). Air pollution induced changes in the photosynthetic pigments of selected plant species. Journal Environmental Boilogy, 30(2): 295-298.
11. Josi, N., Chauhan, A. and Joshi, P.C. (2009). Impact of industrial air pollutants on some biochemical parameters and yield in wheat and mustard plants. Environmentalist, 29: 398-404. https://doi.org/10.1007/s10669-009-9218-4
12. Klein, D.H. (1972). Trace elements in soil of the metropolitan area of Grand Rapids, Michigan (USA). Environmental Science and Technology, 6: 560–562.
13. Li, X.D., Poon, C.S. and Pui, S.L.(2001). Heavy metal contamination of urban soils and street dusts in Hong Kong. Applied Geochemistry, 16: 1361–1368. https://doi.org/10.1016/S0883-2927(01)00045-2
14. Lindsay, W.L. and Norvell, W.A. (1978). Development of DTPA soil test for Zinc, Iron, Manganese and Copper. Soil Science Society of America Journal, 42: 421-428.
15. Liu, Y.J. and Ding, H. (2008). Variation in air pollution tolerance index of plants near a steel factory: implication for landscape-plant species selection for industrial areas. Wseas Transactions on Environment and Development, 4: 24-32.
16. Narin, I. and Soylak, M. (1999). Monitoring trace metal levels in Nigde, Turkey: nickel, copper, manganese, cadmium and cobalt contents of the street dust samples. Trace Elements and Electrolytes, 16(2): 99-103.
17. Navari-Izzo, F. and Rascio, N. (2011). Heavy metal hyperaccumulating plants: How and why do they do it? And what makes them so interesting? Plant science, 180: 169-181. https://doi.org/10.1016/j.plantsci.2010.08.016
18. Olukanni, D.O. and Adebiyi S.A. (2012).Assessment of vehicular pollution of road side soils in Ota Metropolis, Ogun State, Nigeria. IJCEEIJENS, 12(4): 40-46.
19. Palmgren, F., Waahlin P., Kildeso J., Afshari A., and Fogh C.L. (2003).Characterisation of particle emissions from the driving car fleet and the contribution to ambient and indoor particle concentrations.Physics and Chemistry of the Earth,28: 327- 334. https://doi.org/10.1016/S1474-7065(03)00053-6
20. Pichtel, J., Sawyer, H.T. and Czarnowska, K. (1997). Spatial and temporal distribution of metals in soils in Warsaw, Poland. Environmental Pollution, 98:169–174. https://doi.org/10.1016/S0269-7491(97)00131-0
21. Popoola, O.E., Bamgbose, O., Okonkwo, O.J., Arowolo, T.A., Odukoya, O. and Popoola, A.O. (2012). Heavy metals content in playground topsoil of some public primary schools in metropolitan Lagos, Nigeria. Research Journal of Environmental and Earth Sciences, 4(4): 434-439.
22. Soylak, M., Narin. I., Elci, L. and Dogan, M. (2000). Lead concentrations of dust samples from Nigde city, Turkey. Fresenius Environmental Bulletin, 9(1-2): 36-39.
23. Thakur, V.C. and Pandey, A.K. (2004). Late Quaternary tectonic evolution of Dun in fault bend propagated fold system, Garhwal sub-Himalaya. Current Science, 87(11): 1567-1566.
24. Wood, J.M. (1974). Biological cycles for elements in the environment.Science, 183: 1049-1052. https://doi.org/10.1126/science.183.4129.1049
25. Woo, S.Y. and Je, S.M. (2006). Photosynthetic rate and antioxidant enzyme activity of platanus occidental is growing under two levels of air pollution along the streets of Seoul. Journal of Plant Biology, 49(4): 315-319. https://doi.org/10.1007/BF03031162
26. Xiangdong L., Chi-Sun P. and Pui Sum L. (2001).Heavy metal contamination of urban soils and street dusts in Hong Kong. Applied Geochemist. 16: 1361-1368. https://doi.org/10.1016/S0883-2927(01)00045-2
27. Yamagata, N. (1970). Cadmium Pollution in Perspective. Koshu Eiseiin Kenkyi Hokuku Institute of Public Health, Tokyo, 19(1): 1–27.