SimilarityRank
dioxide 0.878 4762
methane 0.843 11786
sulphur 0.829 6647
nitrous 0.820 29606
hydrocarbon 0.817 12320
carbon 0.815 3195
particulate 0.810 25930
tetrachloride 0.806 38419
oxide 0.805 7892
&sub2; 0.803 34174
nitrogenous 0.802 52585
nox 0.799 28969
ethane 0.797 70857
phosphorus 0.796 16679
ammonia 0.793 10958
monoxide 0.790 12904
nitric 0.789 22052
chlorine 0.788 10537
vocs 0.782 67555
co2 0.781 18793
nitrite 0.778 23744
sulphate 0.774 9870
photosynthesis 0.772 18251
trioxide 0.769 83599
polychlorinate 0.768 45744