The first explosion kicks up more dust and even more and bigger explosions follow in rapid succession, said C. James Dahn, president of Safety Consulting Engineers of Schaumburg, Ill. , and an expert on the topic. "The biggest problems we have in plants is that people are not aware of the amount of dust that's in their plant ... I've walked into plants where dust is nearly half a foot deep and people are saying, 'It's just dust, we don't worry about it.' They did when it blew the plant apart. Dust can be an explosive hazard." Two California Democrats in Congress who serve on labor panels, George Miller and Lynn Woolsey, wrote the labor secretary Friday, saying, "a mandatory combustible dust standard should be a high priority of OSHA. Full Article at Kentucky.com