| dioxide gas | 1.58 | That building remains closed for cleaning with chlorine dioxide gas. | ||
| dioxide emission | 0.92 | The result has been a halving of sulphur dioxide emissions in the flue gases.. |
| dioxide gas | 1.58 | That building remains closed for cleaning with chlorine dioxide gas. | ||
| dioxide emission | 0.92 | The result has been a halving of sulphur dioxide emissions in the flue gases.. |