Re ECF Project: ECF 2016-81

Project Title: Formation of secondary particulate matter (PM) from on-road vehicle emissions in Hong Kong

Applicant: Professor Chak K. CHAN, School of Energy and Environment, City University of Hong Kong

Total Approved Grant: $1,483,800

Duration: 1/4/2017 to 31/3/2019

Project Status/Remarks: On-going

Vehicles are known to generate primary PM. Under photochemical ageing, their emissions can also lead to secondary PM. This project aims to determine the mass and chemical components of potential secondary PM from vehicle emissions using a photoreactor, simulating atmospheric ageing with real emissions on roadside. The outcomes of this program provide additional information of the benefits of implementation of current and future vehicle emission control strategies to improving air quality in Hong Kong. The project provides scientific evidence to answer the following three important policy questions in HK:

1. what are the levels of exposure by the public to traffic-related PM?
2. what are the benefits in mitigating secondary PM production from reducing vehicle emissions?
3. to what extent do on-road vehicle emissions contribute to PM, both in primary and secondary aerosols?

The objectives of the project is to experimentally:

1. determine the characteristics of primary gas- and aerosol-phase pollutants from on-road vehicles
2. quantify secondary inorganic and organic aerosol formation potential from on-road vehicle emissions
3. identify the key gas-phase SOA precursors in vehicle emissions

Summary of the Findings/Outcomes:
To be available upon completion of the project