Date of Award
Master of Science (MS)
Shelly L. Miller
This research examined the major pollutants produced by diesel-powered engines within the city of Boulder, Colorado: particulate matter, black carbon, and nitrogen oxides. Ozone was studied due to its secondary formation from nitrogen oxides. Summer and Winter measurements were taken next to the Boulder Downtown Bus Station, for one week in each season. It was not possible to estimate bus emissions due to variability in the number of vehicles and buses traveling in the study corridor.
Bicycle rides were carried out to capture fresh emissions on-road. Black carbon concentration peaked when chasing certain buses, while emissions from other buses were low. Passenger vehicle emissions were not reflected in the black carbon levels.
With the use of MOVES and R-Line, the impact of buses on the concentration of pollutants was analyzed. Results showed the fraction of NOx and PM that could be attributable to buses was between 24-40% and 16-45%, respectively.
Hernandez Pedroza, Josue Rene, "A Study of the Impact of Diesel Buses on Downtown Boulder" (2017). Mechanical Engineering Graduate Theses & Dissertations. 145.