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| 有毒气体井下由于煤炭、矿石、坑木的氧化, 积水和特殊地层吸附氧气，使氧分减少, 或者由于煤炭、矿石及地层中渗出气体的影响，均会使井下空气的成分发生变化。这种气体称为矿井气体、矿井瓦斯或危险气体。有毒气体则指有害气体中微量的带毒性的气体。例如一氧化碳、氮的氧化物等 | |||
| 有毒气体 | |||
| 毒性气体 | |||
| 有害气体; 有毒材料 | |||
| 毒气 | |||
| toxic gas: 6 phrases in 4 subjects |
| Automobiles | 1 |
| Electronics | 3 |
| Explosives and Explosive Ordnance Disposal | 1 |
| Oil / petroleum | 1 |
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