Related by context. Frequent words. (Click for all words.) 71 HFC #a 66 ozone depleting 65 fluorocarbons 63 R#a 62 halon 62 HCFC 61 halogenated 60 nitrogen oxide NOx emissions 59 potent greenhouse gas 59 SF6 58 urea injection 58 oxidizing agent 58 refrigerants 57 exothermic 57 isoprene 57 pentane 57 nitrous oxides 57 absorbs carbon dioxide 57 oxidising 57 Methyl bromide 57 reduce NOx emissions 57 CO ² emissions 57 NF3 56 methane CH4 56 refrigerant 56 N2O 56 Nitrogen oxides 56 ozone depleting chemicals 56 thermally stable 56 particulate filters 56 adipic acid 55 greenhouse gases GHG 55 Biobutanol 55 sulfur oxide 55 ionised 55 stoichiometric 55 HCFCs 55 particulate filter 55 greenhouse gases GHGs 55 Capstone MicroTurbine 55 CO -2 55 smog forming 55 exhaust emission 55 hydroxyl radicals 55 H#O# 54 emmissions 54 Refrigerant 54 oxidizers 54 nitric 54 water vapor 54 oxidant 54 atmospheric pollutants 54 CO2 54 evaporative emissions 54 CFCs 54 Selective Catalytic Reduction SCR 54 hydrofluorocarbons 54 condensing boilers 54 smog forming pollutants 53 asparagine 53 adiabatic 53 Reverse osmosis 53 dioxide 53 String Ribbon 53 combustion gases 53 Glycol 53 CO ² 53 conventional internal combustion 53 Lignin 53 fluorinated 53 subcritical 53 ionizer 53 gaseous emissions 53 polyamides 53 nitrogen oxides NOx 53 Volatile organic compounds 53 evaporative 52 Vapor Flo ® 52 Diesel exhaust 52 ionisation 52 Supercritical 52 sulfur dioxide SO2 52 ultra violet radiation 52 chlorofluorocarbons 52 compact fluorescent lamps CFLs 52 co2 52 HEPA filtration 52 emit CO2 52 AuraGen 52 NExBTL 52 Pyrolysis 52 ultraviolet UV light 52 chlorofluorocarbons CFCs 52 sulfur hexafluoride 52 diaphragm pumps 52 elemental sulfur 52 Burning fossil fuels 52 hydride 52 photocatalytic 52 carbonic acid 52 amorphous silicon Si