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aAmerican Conference of Governmental and Industrial Hygienists.
bNational Institute for Occupational Safety and Health.
cOccupational Safety and Health Administration.
dIncludes standards set in Sweden, Great Britain, and West Germany as examples.
eTLV=threshold limit value—time-weighted average concentration for a normal 8-hour workday, 40-hour week.
fSTEL=short-term exposure limit—15-minute time-weighted average exposure that should not be exceeded.
gTWA=time-weighted average.
hCeil.=ceiling.
iCeiling Limit—concentration that should not be exceeded during any part of the working exposure.
A2—Industrial substance suspect of carcinogenic potential for man; exposure should be avoided.
A1b—Human carcinogen. Substance associated with industrial processes, recognized to have carcinogenic potential without an assigned TLV. For substances of this designation, no exposure or contact by any route—respiratory, skin, or oral, as detected by the most sensitive methods—should be permitted.
NOTE: Materials in ETS for which there are no standards: carbonyl sulfide, 3-methylpyridine, 3-vinylpyridine, anatabine, benz(a)anthracene, benzo(a)pyrene, cholesterol, y-butyrolactone, quinoline, harman, N-nitrosonornicotine, NNK, N-nitrosodiethanolamine, zinc, polonium-210.
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