| Share | Phrase |
|---|
| 18.97% | contaminated [purity] air |
| 18.50% | contaminated [purity] fuel |
| 14.00% | contaminated [purity] oil |
| 12.00% | contaminated [purity] fluid |
| 11.04% | contaminated [purity] fill |
| 7.92% | contaminated [purity] side |
| 5.28% | contaminated [purity] soil |
| 4.20% | contaminated [purity] become |
| 2.88% | contaminated [purity] space |
| 2.67% | contaminated [purity] gas |
| 2.50% | contaminated [purity] mixture |