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Threshold Limit Value

EPA Terms of Environment Dictionary
The concentration of an airborne substance to which an average person can be repeatedly exposed without adverse effects. TLVs may be expressed in three ways: (1) TLV-TWA--Time weighted average, based on an allowable exposure averaged over a normal 8-hour workday or 40-hour work- week; (2) TLV-STEL--Short-term exposure limit or maximum concentration for a brief specified period of time, depending on a specific chemical (TWA must still be met); and (3) TLV-C--Ceiling Exposure Limit or maximum exposure concentration not to be exceeded under any circumstances. (TWA must still be met.)
Provided as a public service by the U.S. Environmental Protection Agency
Environmental Engineering Dictionary
The concentration of an airborne substance to which an average person can be repeatedly exposed without adverse effects. TLVs may be expressed in three ways: (1) TLV-TWA--Time weighted average, based on an allowable exposure averaged over a normal 8-hour workday or 40-hour work- week; (2) TLV-STEL--Short-term exposure limit or maximum concentration for a brief specified period of time, depending on a specific chemical (TWA must still be met); and (3) TLV-C--Ceiling Exposure Limit or maximum exposure concentration not to be exceeded under any circumstances. (TWA must still be met.)

 

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Other Resources

Earth911.org Environmental Glossary

INforEEP Environmental Glossary

NRDC Glossary of Environmental Terms

ESC Glossary

U.S. Environmental Protection Agency

United Nations Environment Programme

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Greenpeace

World Wildlife Fund

GreenNet


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