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CBI areas had the highest PM2.5 levels (mean 37 μg m-3), followed by high-density residential neighborhoods (mean 36 μg m-3), while peri-urban areas recorded the lowest (mean 26 μg m-3). Both PM2.5 and BC levels were highest during the dry dusty Harmattan period (mean PM2.5 89 μg m-3) compared to non-Harmattan season (mean PM2.5 23 μg m-3). PM2.5 at all sites peaked at dawn and dusk, coinciding with morning and evening heavy traffic. We found about a 50% reduction (71 vs 37 μg m-3) in mean annual PM2.5 concentrations when compared to mea
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