The purpose of this study is to collect fuel properties and based on these properties to compile carbon dioxide (CO2) emission factors associated with the combustion of natural gas (NG), liquefied natural gas (LNG), natural gas liquids (NGL), and liquefied petroleum gas (LPG) by provincial and territorial regions from 1990 onwards. When determining fuel properties and CO2 emission factors, the contractor is required to take into account the mix of each type of fuel, and its variation over time, supplied to each region (via internal supply, interregional transfer and import) . As part of this work, an analysis of the applicability of fuel properties and CO2 emission factors for the corresponding fuel types, categories and consumption patterns presented by Statistics Canada in its Report on Energy Supply and Demand must also be completed. The aim is to use the best information available and to be as rigorous as practicable within the budgeted level of effort.