Impacts of polycyclic aromatic hydrocarbons from vehicular activities on the ambient air quality of Lagosmega
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In response to the growing concern about the contribution of polycyclic aromatic hydrocarbons
(PAHs) from vehicular activities in Lagos mega city and their effect on air quality, PAH emissions
were estimated using the emission factors approach. To make these estimates, PAH emission factors
were calculated from the profile ratio of four PAHs emitted from vehicle sources obtained
from the European Environment Agency's emission inventory guidebook, whereas the total number
of registered vehicles based on the type of fuel they use for a period of 10 years was obtained
from Lagos State Bureau of Statistics. Vehicle emissions were estimated using a combination of
individual emission factors, the total number of vehicles in use based on fuel type, and the average
mileage covered. The average highest level of emission of PAHs of 3.542 kilograms (kg) for
gasoline-powered vehicles was obtained in 2013, whereas the average lowest level of emission of
2.679 kg was recorded for diesel-powered vehicles in 2007. In the same manner, 2013 had highest
annual average total emission of 6.384 kg, whereas the lowest annual total PAHs emission of
5.727 kg was recorded in 2007. It is therefore advised that effective control measure should be
put in place by regulatory agency to prevent personnel exposure to these hazardous substances
Keywords
TN Mining engineering. Metallurgy, TP Chemical technology