|
Below is a summary of some of the very similar methods and rationale used by agencies to assess the combined toxic effects of chemicals. ACGIH Source: TLV’s and BEI’s Publication Recommends an additive (combined) approach for two or more substances that affect the same target organ/system The ratio of the exposure concentrations are summed [...] OSHA currently has two standards in which the PEL is adjusted based on the length of the work shift, both of which are lead standards: 29 CFR 1910.1025 29 CFR 1926.62 All other PELs are based upon 8-hour time weighted average (TWA), a short term exposure limit (STEL), or a ceiling limit (C). The [...] The purpose of this memorandum is to resolve issues concerning adjustments of the PEL during extended work shifts. This applies for exposures to the noise levels of Table G-16 of 29 CFR 1910.95 or substances found in Subpart Z. Current OSHA policy requires only the action level to be reduced for exposures to noise [...] |
    |
|
Copyright © 2012 Occupational Health & Safety Hub.com - All Rights Reserved |
|