Archive Notice - OSHA Archive

NOTICE: This is an OSHA Archive Document, and may no longer represent OSHA Policy. It is presented here as historical content, for research and review purposes only.

OSHA requirements are set by statute, standards and regulations. Our interpretation letters explain these requirements and how they apply to particular circumstances, but they cannot create additional employer obligations. This letter constitutes OSHA's interpretation of the requirements discussed. Note that our enforcement guidance may be affected by changes to OSHA rules. Also, from time to time we update our guidance in response to new information. To keep apprised of such developments, you can consult OSHA's website at

February 16, 1978

Mr. Paul E. Calhoon
Route 1
Stratton, Colorado 80836

Dear Mr. Calhoon:

This is in response to your letter of December 26, 1977, relating to the grain elevator explosion in New Orleans. Please accept our apology for the delay in response.

Your concern that air pollution control equipment is causing explosions by trapping grain dust that previously drifted away freely from the facility is understandable. You may be assured that this agency is exploring all potential causes including the possibility of pollution control malfunctions inducing the grain elevators to explode. If you have any further recommendations or suggestions we would be most interested in reviewing them.

Thank you for your interest in this matter. If I may be of any further assistance, please feel free to contact me. I have enclosed a copy of the OSHA Grain Elevator Industry Hazard Alert for your information.


John K. Barto, Chief
Division of Occupational Safety Programming