Abstract: “Adverse health effects were noted with exposure to airborne particulate matter (PM), which is one of the important components of environmental pollution. PM in association with volatile organic compounds, transitional metals, and etcetera poses severe pulmonary and cardiovascular effects in the living beings. Complexity of its association depends on the environmental conditions such as temperature, relative humidity, etcetera and as well as on source and spatial apportionment. In a city like Hong Kong, where more than 7 million people densely populated in a small area of 426 square miles, are prone to different levels of PM exposure based on living standards. A majority of people in Hong Kong and around the world commutes through public transport (MTR train, Bus) and few others on private vehicles. Mixed emissions of these transport vehicles at MTR undergrounds, platform levels and ambient sites can lead to different levels of size segregated PM exposure. This study is aimed at compari”

Keywords: particulate matter, oxidative potential, public transport, hong kong, ambient