AAAR 37th Annual Conference October 14 - October 18, 2019 Oregon Convention Center Portland, Oregon, USA
Abstract View
On-Road Measurement of Auto Brake and Tire Wear Emissions
FARZAN OROUMIYEH, Yifang Zhu, University of California, Los Angeles
Abstract Number: 408 Working Group: Urban Aerosols
Abstract The contribution of mobile sources to air pollution is significant, especially in urban regions. Global and national efforts in the past few decades have led to passing rules and developing technologies to diminish the mobile sources. However, what are generally referred to as mobile sources might be underestimated by limiting them to tailpipe emissions. Since previous research was mostly dedicated to the exhaust-related sources, there is a clear gap of knowledge about non-exhaust traffic sources. These others are considerable and include brake, tire and motor emissions as well as road dust.
We studied brake and tire wear particulate emissions, one of the largest contributors to non-exhaust emissions and focused on the effects of vehicles’ weight on brake and tire wear emissions. Three vehicles with different weights were tested to determine the effect of the weight of the vehicles on brake and tire wear particle emissions. A full-sized SUV, a mid-sized sedan and a compact sedan were tested under an identical driving protocol on a predetermined driving route. The rationale is that since the friction force is generated by pressing the brake pads against the brake disc, more particulate matter (PM) is expected to be released from the brake lining material of heavier vehicles at a given stopping distance. First, an optimum route which had reasonable traffic load was selected. Further, the vehicles were driven on the selected route with instruments installed inside the vehicle measuring for PM10 and particle number concentration (PNC) and PM size distribution at two inlets: 1. brake inlet and 2. ambient inlet. The results showed an apparent increase in PM10 and PNC levels with an increase in vehicles’ weight.