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Previous Volume 348:175-176 January 9, 2003 Number 2 Next

	Since this article has no abstract, we have provided an extract of the first 100 words of the full text and any section headings.

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To the Editor: Martyny et al. (Sept. 12 issue)¹ provide a very useful review of respiratory protection; however, a few points should be noted. Some self-contained breathing apparatuses, such as rebreathers, can last several hours. The note that air-purifying respirators should be used only when the hazardous substance has warning properties is applicable only in the case of gases and vapors, since the cartridges for these substances can become saturated and allow "breakthrough." (It is generally assumed that particulate filters become more efficient with use.) In fact, the current regulations of the Occupational Safety and Health Administration (OSHA)² do not . . . [Full Text of this Article]

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