Selected OSHA Risk Estimates for Prior and Current Permissible Exposure Limits
[Excess Cancers per 1000 workers]
---------------------------------------------------------------------------------------------------------------Standard

Risk at prior PEL

Risk at current PEL Fed. Register date

---------------------------------------------------------------------------------------------------------------Ethylene Oxide...

63-109 per 1000

1.2-2.3 per 1000

June 22, 1984.

Asbestos.........................

64 per 1000

6.7 per 1000

June 20, 1986.

Benzene..........................

95 per 1000

10 per 1000

September 11, 1987.

Formaldehyde..................... 0.4-6.2 per 1000

0.0056 per 1000

December 4, 1987.

Methylenedianiline............. *6-30 per 1000

0.8 per 1000

August 10, 1992.

Cadmium..........................

3-15 per 1000

September 14, 1992.

1,3-Butadiene.................... 11.2-59.4 per 1000

1.3-8.1 per 1000

November 4, 1996.

Methylene Chloride............ 126 per 1000

3.6 per 1000

January 10, 1997.

Chromium VI.................... 101-351 per 1000

10-45 per 1000

February 28, 2006.

58-157 per 1000

Crystalline Silica:
General Industry.....

**13-60 per 1000

Construction/Shipyard… **27-653 per 1000

***6-26 per 1000 N/A [proposed]
***6-26 per 1000 N/A [proposed]

---------------------------------------------------------------------------------------------------------------* no prior standard; reported risk is based on estimated exposures at the time of the rulemaking
** estimated excess lung cancer risks at the current PEL
*** estimated excess lung cancer risks at the proposed new PEL

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