Related by context. Frequent words. (Click for all words.) 61 potent greenhouse gas 60 Nitrogen oxides 60 Burning fossil fuels 57 fluorocarbons 57 absorbs carbon dioxide 56 methane CH4 55 Volatile organic compounds 55 Sulfur dioxide 54 gases emitted 54 gaseous emissions 54 smog forming pollutants 53 pollutants emitted 53 gases 52 biomass combustion 52 dioxide 52 monoxide 52 sulfur dioxide SO2 52 heat trapping gases emitted 52 atmospheric pollutants 51 sequester carbon dioxide 51 emit CO2 51 methane ethane 51 absorbs sunlight 50 gasoline vapors 50 methane 50 nitrogen oxide sulfur dioxide 50 nitrogen trifluoride 50 smog forming 50 oxidise 50 combustion gases 50 nitrogen oxide NOx emissions 50 aerosol particles 50 CO -2 50 sulfur dioxides 49 carbon dioxide 49 flue gases 49 gasses 49 airborne pollutants 49 particles emitted 49 respiratory irritant 49 nitrogen oxides NOx 49 unvented 48 sulfur hexafluoride 48 pollutants 48 oxidising 48 fluorinated gases 48 greenhouse gases GHGs 48 combustible gases 48 aromatic hydrocarbons 48 mercury emitted 48 hydroxyl radicals 48 cement kiln 48 noxious chemicals 48 incomplete combustion 48 CO2 48 nitrogen oxides 48 paints solvents 48 noxious gases 48 decomposing organic 47 pollute waterways 47 regulate heat trapping 47 carbon dioxide CO2 47 invisible odorless 47 deplete oxygen 47 heat trapping carbon dioxide 47 combustion 47 emmissions 47 Particulates 47 ionised 47 emissions 47 sulfur dioxide emission 47 oxidizes 47 pollution 47 oxyfuel 47 emitting 47 greenhouse gases 47 nitrous oxides 47 combusts 47 pollutant 47 exothermic 47 isoprene 47 reduce NOx emissions 47 respire 47 emission 47 sulfuryl fluoride 47 biogenic 46 emitted 46 co2 46 sulfur dioxide 46 Pyrolysis 46 particulate matter emissions 46 boiling kettle 46 CO ² 46 nitrous oxide emissions 46 particulate emissions 46 chemical solvents 46 gasified 46 toxic byproducts 46 gasifying 46 Diesel exhaust 46 Carbon dioxide emissions