California Air Resources Board

Principal Investigator/Authors: Michael Jerrett

Contractor: University of California, Los Angeles

Contract Number: 19RD007

Project Status: Completed

Relevant CARB Programs: Mobile Source Emissions Inventory

Topic Areas: off-road equipment, Non-Exhaust Emissions

Research Summary:

Site selection strategies for traffic-related air emission monitoring exist and have been employed by public health and air quality management professionals; however, these strategies have focused largely on tailpipe emissions. This study will be one of the first efforts to determine how to adapt or evolve these strategies, or develop new strategies, for brake and tire wear emissions specifically. This study will provide a methodology to prioritize potentially competing needs when selecting sites for monitoring. These competing needs may include: the need to select sites that (1) encompass the full distribution of exposure levels, (2) can be used to model interpolated surfaces with minimal gaps in coverage or precision, and (3) can be representative of the participant sample for which health outcomes would be investigated. This study will include a literature review of monitoring site selection approaches ideal for detecting and interpolating brake and tire wear emissions. A Multiple Criteria Decision Analysis (MCDA) suitability score method will be created based on this literature, as well as expert knowledge of spatial features that can be considered critical for site selection. The study will provide an analysis of alternative strategies and recommendations for future use of the methodology.

Keywords: non-exhaust emissions, brake wear, tire wear, brake and tire wear emissions, mobile source emissions inventory, mobile source emissions, particulate matter (PM)