Related by context. Frequent words. (Click for all words.) 66 refrigerants 65 ozone depleting 62 HCFC 61 particulate filters 60 refrigerant 58 SF6 57 HCFCs 56 exhaust emission 56 nitrous oxides 55 compact fluorescent lamps CFLs 55 CFCs 55 Refrigerant 54 leaded petrol 54 AuraGen 54 Selective Catalytic Reduction SCR 53 RoHS Restriction 53 particulate matter emissions 53 coolants 53 chlorofluorocarbons CFCs 53 particulate filter 52 freon 52 halogens 52 CO ² 52 diesel particulate filters 52 incandescent lamps 52 exhaust emissions 51 emmissions 51 Freon 51 NOx reduction 51 greenhouse gases GHG 51 particulate emissions 51 brominated 51 ASTM D# [002] 51 ozone depleting chemicals 51 dioxide 51 diesel particulate filter 51 VOC emissions 50 aftertreatment 50 VOCs 50 Lithium Ion batteries 50 Lithium ion 50 harmful gases 50 HEVs 50 hybrid powertrains 50 sulfur dioxide SO2 50 methylene chloride 50 halogen 50 NF3 50 air conditioners refrigerators 50 N2O 50 HFCs 50 emission 50 particulate matter PM 49 nitrogen oxide NOx 49 hydraulic fluids 49 CO2 emitting 49 ethylene oxide 49 BlueTec 49 gaseous fuels 49 sulfur oxide 49 solvents 49 AdBlue 49 fluorescent lamp 49 incandescent lamp 49 RoHS Directive 49 #KW [001] 48 sulfur hexafluoride 48 diesel engines 48 metal hydride 48 sorbents 48 carbon dioxide emission 48 NOx emissions 48 #/#/EC [002] 48 CO2 emissions 48 DMFCs 48 ozone depleting substances 48 DPF 48 conventional internal combustion 48 gas recirculation EGR 48 1kW 48 halogen bulbs 48 watt incandescent bulbs 48 NOx 48 downlight 48 additive MTBE 47 CO2 47 incandescent lighting 47 emitting 47 SOFCs 47 Carbon dioxide emissions 47 carbon tetrachloride 47 CO2 emission 47 NGVs 47 pollutants emitted 47 fluorinated 47 Li ion batteries 47 reducing CO2 emissions 47 chlorofluorocarbons 47 NO2 47 NiMH batteries 47 #g/km CO2 [001]