Alberta emitted the highest proportion of VOCs in 2013, representing 32% (687 kt) of national emissions (2135 kt). The main source of VOCs in this province was the oil and gas industry. Ontario was responsible for 20% (438 kt) of national emissions, with transportation and paint and solvent use as the most important sources. Quebec was the third largest emitter, with 15% (329 kt) of national emissions, where home firewood burning, paint and solvent use and transportation accounted for almost 75% of the emissions in that province. All provinces experienced reductions in emissions between 1990 and 2013. For most of them, the reductions were well above 40%.