VOCs are important class of air pollutants because they are ubiquitous and associated with increased
short and long - term health risks in the industrial areas and environs. The air samples were
collected by passive sampler (ORSA 5) from two contrastive industrial areas such as Ikeja and Isolo
industrial areas. The air samplers were exposed to a height of 1.5 - 2.0m and sampling was carried
out four times a month for a period of 12 months. The adsorbed VOCs were desorbed with
carbondisulphide (CS2) and the solution analysed using Gas Chromatography (GC) fitted with Flame
Ionization Detector (FID). Twenty - Six (26) VOCs were captured in the Atmosphere of each of the
studied areas. Seven (7) VOCs each were identified as the major contributors to ambient air
pollution in Ikeja and Isolo industrial areas. There is a significant difference (Pvalue < 0.05) between
the levels of VOCs in the studied areas. The meteorological parameters showed significant
correlations with the ambient concentrations of VOCs. The monthly mean concentrations of the
atmosphere total volatile organic compounds (TVOCs) in the studied areas show significant
difference. The Principal Component Analysis (PCA) showed that the major sources of VOCs are
mainly anthropogenic and four factors each were identified as sources of VOCs in each of the
studied industrial areas with industrial emissions dominating in industrial areas.