Date: Fri, 3 Dec 2010 17:02:01 -0500
Reply-To: DCHAS-L Discussion List <DCHAS-L**At_Symbol_Here**LIST.UVM.EDU>
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From: ILPI <info**At_Symbol_Here**ILPI.COM>
Subject: Re: OHSA/NIOSH Permissible limits
In-Reply-To: <AANLkTimx-3P2SS3xzQWcQsV6JGNGdHTTtfHTzc7RWXKj**At_Symbol_Here**>

I sense the toxicologists on the list getting all atingle here.  Prepare for an avalanche of replies!  I'll leave the details of why the two organizations came up with different numbers to others (short answer - different methods, different studies, different criteria etc.)

The best choice from any perspective is 0 ppm, and after that ALARA - As Low As Reasonably Achievable.  See ref/alara.html and the references therein for more on the ALARA concept.

Rob Toreki

Safety Emporium - Lab & Safety Supplies featuring brand names
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On Dec 3, 2010, at 4:22 PM, Jim Tung wrote:

Hello, all:

When the NIOSH pocket guide has different permissible limits (NIOSH versus OSHA), which is the better one to follow?

For example, benzene's limit for NIOSH is 0.1 ppm (10 hr workday), while OSHA's limit is 1 ppm (8 hour workday.)

Why the difference? =46rom a legal perspective, which is a better choice?

Thanks in advance for any advice you might give; obviously, any advice people might give is non-binding, you're not responsible, legal mumbo-jumbo, blah, blah.

Cheers, Jim Tung

Lead Hazardous Waste Coordinator
Obiter Research LLC
Champaign, IL

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