Emission Rates of Gaseous Pollutants from Motor Vehicles

This study aimed at calculating emission rates of gaseous pollutants from gasoline fueled motor vehicles. Data were obtained from the Jordanian Ministry of Environment, Department of Driving and Vehicles Licensing at Marka, Amman and from a private smog check station in Irbid. Our findings indicate that measured concentrations of gaseous tailpipe pollutants are within the Jordanian standards. Average concentrations of carbon monoxide, carbon dioxide, hydrocarbons, and nitrogen oxides are 3.12%, 11.21%, 398.92 ppm, and 88.78ppm, respectively. Average emission rates are found to be 33.9, 198.4, 1.0, and 0.1 gram per kilometer traveled for carbon monoxide, carbon dioxide, hydrocarbons, and nitrogen oxides, respectively with an estimated uncertainty of ±10%. Emission rates are found to be dependent on many factors including year of manufacture, engine capacity, and fuel type. New vehicles and vehicles with low engine capacity are cleaner than old vehicles and vehicles with high engine capacity.