No harmful gases or water will get into the environment.

有害气体或水都无法进入此环境中。

youdao

No harmful gases and hazardous substances to human harm.

无有害气体和有害物质，对人体无害。

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Not only have the advantages of sending no harmful gases of formaldehyde, benzene, ammonia and TVOC (volatile organic compounds) out, also with the function of absorbing diversified pernicious gases.

不仅具备不散发甲醛、苯、氨气、VOC（挥发性有机化合物）等有害气体的优点，而且具有吸附有害气体的功能。

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No other workers remain in the tunnel at this time, according to Mack, and no one was exposed to harmful gases as a result of the accident.

CNN: STORY HIGHLIGHTS

Fuel cells offer several advantages: they do not have moving parts and there is no burning involved, so there are negligible emissions of environmentally harmful gases like nitrogen, sulfur oxide and carbon monoxide.

FORBES: Magazine Article