Related by context. Frequent words. (Click for all words.) 68 fluorocarbons 65 HFC #a 64 MDIs 63 CFCs 63 chlorofluorocarbons CFCs 62 ozone depleting 62 Inhalers 61 chlorofluorocarbons 61 Methyl bromide 61 halogenated 59 HCFC 59 ozone depleting chemicals 58 R#a 58 refrigerants 57 SF6 57 oxidizers 57 refrigerant 56 ozone depleting substances 56 asthma inhalers 55 compact fluorescent lamps CFLs 55 hypochlorite 55 propellants 55 sulfur hexafluoride 54 inhalers 54 Nitrogen oxides 54 hydrofluorocarbons 54 nebulizers 53 freon 53 transdermal patches 53 adipic acid 53 toxic solvents 53 sevoflurane 53 HCFCs 53 phosphine 53 unvented 52 Pulmicort Respules 52 HEPA filtration 52 H#O# 52 Hydrogen peroxide 52 Reverse osmosis 52 smog forming pollutants 52 particulate filters 52 Refrigerant 52 potent greenhouse gas 52 elemental mercury 52 dehumidifying 52 suppressants 52 HEPA filters 52 nitrogen trifluoride 52 Selective Catalytic Reduction SCR 52 aerosol 52 kerosene stoves 51 NF3 51 rechargeable lithium batteries 51 gases 51 oxidising 51 evaporative coolers 51 Dextromethorphan 51 ultrapure water 51 dioxide 51 Freon 51 Zanamivir 51 harmful gases 51 pentane 50 suspected carcinogen 50 polyamides 50 isocyanate 50 aerosol sprays 50 sodium borohydride 50 sorbent 50 ultraviolet UV light 50 aerosols 50 nitrogen oxide NOx emissions 50 isobutane 50 inorganic fertilizers 50 oxidant 50 aluminum chloride 50 photocatalyst 50 ethylene oxide 50 gaseous fuels 50 ionisation 50 ionizer 50 microencapsulated 50 smog forming 50 aromatic hydrocarbons 50 Particulates 50 Hydrazine 50 dental amalgam 50 argon gas 50 Earth ozone layer 50 ionised 50 Preservative 50 nasal decongestants 49 biocide 49 SCR catalyst 49 nitrous oxides 49 renewably sourced 49 antifungal agent 49 organic solvents 49 retardants 49 sulfur oxide