Fig. 1From: Exhaust emission factors of greenhouse gases (GHGs) from European road vehiclesMethane (CH4) emission factors from L-category, light-duty and heavy-duty vehicles. “NA” stands for not available. Error bars stand for min and max values. “Hybrid” category includes hybrid-gasoline vehicles. Label “Tamp.” stands for tampered vehicle (Veh. 28)Back to article page