This report provides a discussion on the relevance of measuring greenhouse gas emissions, particularly carbon dioxide (CO2), as well as air pollution from the transport sector from various methodologies and using the activity-structure-intensity-fuel (ASIF) type model. It aims to guide authorities and researchers in Asia in measuring O2emissions, as well as air pollutants from the urban transport sector. It also provides a discussion on the key parameters needed to be routinely collected by authorities to come up with an accurate estimate of the emissions.