It was more sensitive to poisonous gases than they were.

In addition, there was the constant danger of poisonous gas.

There could be a layer of poisonous gas near the ground.

It is used to control the release of poisonous gases over the Island.

Not all of the Rebels had been overcome by the poisonous gas.

The threat of attack with poisonous gas makes that memory seem even more relevant.

"The poisonous gas and the superheated air brought her down."

Water vapor and poisonous gas come out of the other.

This had a huge reaction with water, which produced a poisonous gas.

We had found no way of recycling the poisonous gases.