Combustible dust can be generated from most substances—plastics, metals, chemicals and foods—especially when ground or rendered finely enough. It can then spontaneously combust given the right environmental triggers.

A 2006 study by the board found at least 281 dust explosions and fires in the U.S. between 1980 and 2005. The accidents killed 119 workers and injured another 718. According to more recent figures, there's been no change in the frequency of deaths and injuries from dust accidents, despite more inspections and an OSHA education program.

In OSHA's just-released, twice-yearly regulatory agenda, the only notation about a combustible dust regulation was "next action undetermined."

NOTE: The details in this blog are provided for informational purposes only. All answers are general in nature and do not constitute legal advice. If legal advice or other expert assistance is required, the services of a competent professional should be sought. The author specifically disclaims any and all liability arising directly or indirectly from the reliance on or use of this blog.

OSHA has identified the National Fire Protection Association (NFPA) and its standard NFPA 652 as the basis for the new OSHA standard.

An electronic comment form and instructions are available at www.regulations.gov in Docket No. OSHA-2009-0023, RIN 1218-AC41. The public commentary period closes Jan. 19, 2010.

Additional information on combustible dust explosions can be found in an OSHA Hazard Alert released in March 2008.