Abstract:
Road traffic emission inventories based on bottom-up methodology, are calculated for each
road segment from fuel consumption and traffic volume data obtained during field measurements
in Yopougon. High emissions of black carbon (BC) from vehicles are observed at major road
intersections, in areas surrounding industrial zones and on highways. Highest emission values
from road traffic are observed for carbon monoxide (CO) (14.8 t/d) and nitrogen oxides (NOx)
(7.9 t/d), usually considered as the major traffic pollution tracers. Furthermore, peak values of
CO emissions due to personal cars (PCs) are mainly linked to the old age of the vehicle fleet with
high emission factors. The highest emitting type of vehicle for BC on the highway is PC (70.2%),
followed by inter-communal taxis (TAs) (13.1%), heavy vehicles (HVs) (9.8%), minibuses (GBs) (6.4%)
and intra-communal taxis (WRs) (0.4%). While for organic carbon (OC) emissions on the main roads,
PCs represent 46.7%, followed by 20.3% for WRs, 14.9% for TAs, 11.4% for GB and 6.7% for HVs.
This work provides new key information on local pollutant emissions and may be useful to guide
mitigation strategies such as modernizing the vehicle fleet and reorganizing public transportation,
to reduce emissions and improve public health.
