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Threshold Limit Values
STEL; TLV-BLV; TLV-Biological Limit Value; TLV-Ceiling; TLV-STEL; TLV-TWA; TLV-Time Weighted Average; STELs; TLV BLV; TLV Ceiling; TLV STEL; TLV TWA; TLV-BLVs; TLV-Ceilings; TLV-STELs; TLV-TWAs
Standards for limiting worker exposure to airborne contaminants. They are the maximum concentration in air at which it is believed that a particular substance will not produce adverse health effects with repeated daily exposure. It can be a time-weighted average (TLV-TWA), a short-term value (TLV-STEL), or an instantaneous value (TLV-Ceiling). They are expressed either as parts per million (ppm) or milligram per cubic meter (mg/m3).