[1] WHO Regional Office for Europe (2000) Air Quality Guidelines. 2nd Edition, Copenhagen.
[2] Ndiokwere, C.L. (2004) Chemistry and the Environment. A Synopsis, University of Benin, Benin City.
http://www.nuc.edu.ng/nucsite/File/ILS%202004/ILS-133.pdf
[3] Ukpebor, E.E., Ukpebor, J.E., Eromomene, F., Odiase, J.I. and Okoro, D. (2010) Spatial and Diurnal Variations of Carbon Monoxide (CO) Pollution from Motor Vehicles in an Urban Space. Polish Journal of Environmental Studies, 19, 817-823.
[4] Erah, P.O., Akujieze, C.N. and Oteze, G.E. (2002) The Quality of Ground Water in Benin City: A Baseline Study on Inorganic Chemicals and Microbial Contaminants of health Importance in Boreholes and Open Wells. Tropical Journal of Pharmaceutical Research, 1, 75-82.
[5] Omofonmwan, S.I. and Eseigbe, J.O. (2009) Effects of Solid Waste on the Quality of Underground Water in Benin Metropolis, Nigeria. Journal of Human Ecology, 26, 99-105.
[6] National Bureau of Statistics (2009) Social Statistics in Nigeria. Official Results of the 2006 National Census.
www.nigerianstat.gov.ng
[7] Australian Standard 2922 (1987) Ambient Air—Guide for the Siting of Sampling Units. Standards Association of Australia, Home bush NSW, Australia.
[8] Jacobson, M.Z. (2005) Fundamentals of Atmospheric Modelling. 2nd Edition, Cambridge University Press, New York.
http://dx.doi.org/10.1017/CBO9781139165389
[9] Rene, G.T. (2008) An Air Quality Baseline Assessment for the Vaal Air Shed in South Africa. A Master Thesis Dissertation, Geoinformatics and Meteorology Department, University of Pretoria, South Africa.
[10] Ukpebor, E.E., Ukpebor, J.E., Oviasogie, P.O., Odiase, J.I. and Egbeme, M.A. (2006) Field Comparison of Total Suspended Particulates (TSP) Samplers to Assess Spatial Variation. International Journal of Environmental Studies, 63, 567-577.
http://dx.doi.org/10.1080/00207230600963866
[11] International Standards Organisation ISO 14644-1 (1999) Clean Rooms and Associated Controlled Environments-Part 1: Classification of Air Cleanliness.
www.iso.org/iso/catalogue