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He said his system would also "provide reduced or zero emission of environmentally harmful gases."

Hyperbaric treatment helps remove harmful gases from the blood.

Gas leak detection methods became a concern after the effects of harmful gases on human health were discovered.

The agency decided to issue at the same time a new standard for ozone, another harmful gas that helps form smog.

Also, they detoxify some of the harmful gases, such as ammonia.

This allows it to run more efficiently and generate fewer harmful gases.

The production of harmful man-made gases tipped the balance against ozone.

Some wondered whether a meteorite's impact released harmful gases and possible radiation.

Since 1970 the amount of harmful gases emitted by the state has grown by 75%.

We should also introduce more restrictive regulations to reduce emissions of harmful gases by cars.