Any gas generated by the initial inferno has dissipated, they said.

The gas dissipated the farther it spread, and its intensity diminished.

By the time he revived, the gas had dissipated.

The gas which had robbed him of strength dissipated.

The gas was dissipating but it still stank, even up here.

No suspects were identified, and the gas dissipated naturally.

The gas had dissipated and they no longer needed gas masks.

Though the carbon monoxide levels in that section of the mine were very high, the gas was also dissipating, he said.

The gas had leaked out, ever so slowly, made its way to the surface and dissipated.

Eventually the gases dissipated, a part of them to make new suns and planets.