The main motivation for Middle East andNorth Africa Region (MENA) governments to improve energyefficiency is to address pressing domestic concerns, such asurban air pollution, energy security, economiccompetitiveness, the fiscal cost of energy subsidies and thebalance of payments. However, improved energy efficiency isalso seen as the most promising route for reducing theregion's green house gas (GHG) emissions. Therefore, aspart of the study on energy efficiency in MENA, this reportaims to describe and quantify the links between energyefficiency and GHG emissions as well as urban air pollutionin MENA. More specifically, the objectives of the report is:(i) to create scenarios of emissions of GHG and selectedurban air pollutants (specifically, particulate matter (PM))under different assumptions of energy efficiencyimprovements; (ii) to identify the country/sectors whereenergy efficiency improvements are likely to have thegreatest impact upon GHG and PM emissions; and (iii) tobenchmark MENA against other regions in terms of energyintensity and GHG emissions.