Dust

Petroleum coke or petcoke, similar to coal, is a nasty though salable byproduct of the oil refining process. Produced from refining tar sands crude in Indiana refineries, it is stored in huge piles in Chicago, blowing dust in the Southeast Side.
Dec 28, 2013   NPR Morning Edition
When Los Angeles drained Owens Lake to bring water into its quickly growing urban basin, it simultaneously created a dry lakebed and one of the worst dust pollution problems in America. Various efforts to fight the problem have only failed.
Jan 27, 2011   Places