The term " Threshold Limit Values ( TLV ?) " was introduced in 1956.
2.
The Threshold Limit Values for Chemical Substances ( TLV ?CS ) Committee was established in 1941.
3.
In 1990, ACGIH adopted a time weighted average Threshold Limit Value of 2ppm for work related skin exposure.
4.
The American Conference of Governmental Industrial Hygienists has established threshold limit values ( TLVs ) for most of these compounds.
5.
In the United States and some European countries a Threshold Limit Value of 500 parts per million ( Clean Air Act.
6.
The American Conference of Governmental Industrial Hygienists publishes a more extensive list of STELs as threshold limit values ( TLV-STEL ).
7.
A large number of volatile substances have been detected during flight mostly within their threshold limit values and NASA Spacecraft Maximum Allowable Concentration Limits.
8.
ACGIH ?establishes the Threshold Limit Values ( " TLVs ?" ) for chemical substances and physical agents and Biological Exposure Indices ( " BEIs ?" ).
9.
The first list of Threshold Limit Values and Biological Exposure Indices ( the " TLVs ?and BEIs ?" book ) was published in 1962 " ."
10.
It is a proven human carcinogen standing on the WHO List of IARC Group 1 carcinogens, with a current threshold limit value of 0.01 ppm in the industrial atmosphere.
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