The Interpretation you are attempting to access, "A confined space atmosphere above a PEL is not always a "hazardous atmosphere" [1910.146(b)]", is reserved for subscribers.

Excerpt from "A confined space atmosphere above a PEL is not always a "hazardous atmosphere" [1910.146(b)]"
If a confined space has an atmospheric concentration of a Subpart Z contaminant over its Permissible Exposure Limit (PEL); but it is not capable of causing death, incapacitation, impairment of ability to self - rescue, injury, or acute illness; would this atmosphere meet the definition of a hazardous atmosphere?

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Internal Reference: Catcode=A221 Funcode=SZ47