Facilities in which explosion hazardous atmosphere can be generated are divided into three zones.
设施的爆炸危险的气氛中产生的，可以分为3个小区。
The EEBD are only used for escape from a compartment that has a hazardous atmosphere to provide personnel breathing protection.
自给式压缩空气呼吸保护装置，仅用于从危险气体的场所逃生。
One is black carbon and the other is ozone, which is vital for blocking ultraviolet rays in the stratosphere but hazardous in the bits of the atmosphere where plants live and people have to breathe.
其一是黑碳，另一样是臭氧，后者对阻止平流层的紫外线起着至关重要的作用，但对大气中的植物和人类有害。
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