Effect of road grade, vehicle speed and vehicle type on NO2 emissions on urban roads in Jordan

Abstract

Motor vehicles emit gaseous air pollutants including sulphur dioxide, carbon monoxide (CO), carbon dioxide (CO2) nitrogen oxides (NOx), volatile organic compounds (VOC), and particulate matter (PM). Vehicle exhausts are confirmed as a main contributor to air pollution. The purpose of the study is intended to understanding emission rates of gases vehicle's emission in Jordan and to reveal the impact of driving conditions such as road grade, vehicle speed, number of vehicles and vehicle types in urban areas. In this study, gaseous emissions of NO2 were measured as an indicator for other vehicle gaseous pollutant. The maximum measured emission rate for NO2 was 0.15 ppm and the mean average emission rate for NO2 was 0.077 ppm. Overall, our finding highlights a significant influence of road grade, speed, type and number of vehicle with the rate of NO2 emission. The observed trends indicate there is a need for further investigation to includes other gaseous pollutant.