51.   They are particularly troubled that galactic dust may be confusing astronomers on how far away the supernovas are.

52.   We lunged and plunged, bumping and grinding, and the dust was a chalky fog.

53.   While stone dust is good as a base, sand is better to sprinkle between the tightly-packed bricks because it has fewer pebbles than stone dust.

54.   Dust is everywhere.

55.   Dust from roads is the largest single source.

56.   Even the white concrete dust is visible in some orbital views.

57.   Health officials deny news reports that the dust is poisonous enough to pose a public hazard.

58.   The birds were quiet, there was dust in the air.

59.   The dust is capable of drastically reducing visibilities ... Causing poor air quality and giving hazy appearance to the sky.

60.   The dust is capable of drastically reducing visibilities, causing poor air quality and giving a hazy appearance to the sky.