SimilarityRank
dioxide 0.820 4762
sulphur 0.815 6647
pollutant 0.792 10281
nox 0.790 28969
carbon 0.765 3195
monoxide 0.757 12904
co2 0.752 18793
cfc 0.750 9251
ozone-depleting 0.732 40272
nitrogen 0.731 6386
particulate 0.727 25930
halon 0.726 27495
tetrachloride 0.725 38419
oxide 0.722 7892
chlorofluorocarbon 0.720 24061
hydrocarbon 0.719 12320
pollution 0.718 2289
nitrous 0.709 29606
ozone 0.709 5037
hcfc 0.707 89263
biofuel 0.705 57289
so2 0.705 62009
ozone-damaging 0.703 88642
incineration 0.700 18636
&sub2; 0.700 34174