The atmosphere of menace in the square beyond thickened like a storm.

The atmosphere was thickening now; the world around her darkening.

Day-to-day changes are too small to notice, but the atmosphere constantly thickens and every year holds a little more water vapor.

The atmosphere was thickening rapidly these days, fifteen millibars a year on average.

The atmosphere on the Bridge was thickening with tension.

When this occurs, the atmosphere thickens, winds get stronger, and larger areas on the surface can support liquid water.

The pressure outside was rising steadily as the atmosphere thickened into liquid.

We watched the atmosphere thicken and develop, watching it change in composition.

The situation was tightening and the atmosphere was thickening.

Within minutes the atmosphere had chilled and thickened.