Here is the background – On January 30, 2007 OSHA issued a Letter of Interpretation entitled, “Use of the IOM sampler for dust inhalation and compliance with the PNOR requirements of 29 CFR 1910.1000”. In this interpretation, OSHA stated that “Side –by-side samples collected using the IOM sampler and 37 mm filters will usually show lower results with the IOM sampler”. SKC provided published peer-reviewed scientific literature stating there was no bias. The article can be found in Ann. Occup. Hyg. Vol 30 1986 pp 89-102.Members of the British Occupational Hygiene Society (BOHC) can access the journal article. Here is the link to the BOHC site -
SKC sent the rebuttal letter in 2007, soon after OSHA’s published interpretation. On November 8, 2011, almost 5 years later, OSHA responded – hence the better late than never saying. In this letter, OSHA agrees with the published literature and states that the IOM sampler may be used as an equivalent method when measuring an employee’s exposure to particulates not otherwise regulated (PNOR). OSHA goes on to say that the January30, 2004 letter of interpretation has been withdrawn.
Galson Laboratories is now offering IOM samplers as part of its FreePumpLoan™ Program. It includes everything you need to collect dust inhalation samples for OSHA compliance – all you pay for is the analysis and the shipping costs.
With OSHA allowing the use of IOM samples for PNOR compliance exposures, the Heath and Safety Professional as another tool in their toolbox to assist them in protecting workers. I think we can all agree - this is a good thing and better late then never is welcomed.
Categories: OSHA News