The California Division of Occupational Safety and Health (Cal/OSHA) has proposed a permissible exposure limit (PEL) for n-methyl-2-pyrrolidone (NMP), a solvent, of 1 part per million (ppm) in air as an 8-hour time-weighted average (TWA). In addition, Cal/OSHA has proposed an equivalent PEL in units of milligrams per cubic meter of air (mg/m3) as well as a “skin” notation for NMP, which indicates that substantial exposure may occur if the chemical comes in contact with skin, mucous membranes, or eyes.
According to Cal/OSHA
, “this PEL is necessary to reduce the risk of developmental effects in the offspring of exposed workers.”
Following are a few resources on NMP that may be of interest:
This article was updated on June 20, 2013, to include information about the AIHA WEEL for NMP. The original article incorrectly stated that the Cal/OSHA PEL for NMP would be the first exposure limit for the chemical in the United States. The article should have stated that the Cal/OSHA PEL would be the first exposure limit for NMP published by a public health agency in the U.S. AIHA apologizes for and regrets the error.