The fine ash from combustion processes that becomes dispersed in the air. To the casual observer it might appear as smoke, and indeed it is often found mixed with smoke. Fly ash arises because fuels contain a small fraction of incombustible matter....

Finely divided particulate matter emitted to atmosphere or deposited within chimneys and flue linings, being derived from combustion processes, especially those involving coal. Fly ash can contain portions of unburnt fuel as well as toxic chemicals...

Viewpoint: Yes, fly ash cement is an inferior building and structural material in terms of durability, safety, and environmental effects. Viewpoint: No, fly ash has proven to be an excellent building and structural material that actually can enhance...

Fly ash is the residue from the combustion of coal. In the past it was generally released into the atmosphere, out of the smoke stack, but pollution control equipment mandated in recent decades now require that it be captured prior to release. It is...

Columns of yellow-brown smoke billowed from behind a mountain and flames shot from a high ridge before leaping toward us.This Greek village was in a ring of fire and so was I _ racing away from the blaze and approaching it to snap pictures, trapped...

Some mine disasters happen in a flash, like the Utah cave-in last month that apparently entombed six coal miners. Others unfold in slow motion.That's the case in Galena, where hundreds of now-abandoned lead and zinc mines dug underneath the small town by prospectors in the...