Flavoring Chemicals in E-Cigarettes: Diacetyl, 2,3-Pentanedione, and Acetoin in a Sample of 51 Products, Including Fruit-, Candy-, and Cocktail-Flavored E-Cigarettes

http://dx.doi.org/10.1289/ehp.1510185



Table 3. Occupational exposure guidelines in parts per million.
Agency Averaging time 2,3-Pentanedione Diacetyl Acetoin Reference
Abbreviations: NA, not available; PEL, permissable exposure limit; REL, recommended exposure limit; STEL, short-term exposure limit; TLV, threshold limit value.
aDraft occupational exposure limit (ppm). *Adjusted OEL (occupational exposure limit) using Brief and Scala method.
OSHA PEL 8-hr NA NA NA OSHA 2015
16-hr* NA NA NA
NIOSH REL 8-hr 0.0093a 0.005a NA (10-hr) NIOSH 2011
16-hr* 0.0023 0.00125 NA
NIOSH STEL 15-min ceiling 0.031a 0.025a NA NIOSH 2011
ACGIH TLV 8-hr NA 0.01 NA ACGIH 2014
16-hr* NA 0.0025 NA
ACGIH STEL 15 min NA 0.02 NA ACGIH 2014