《英文msh詞典》TLV Ceiling
[入口詞] TLV Ceiling
[主題詞] Threshold Limit Values
[英文釋義] 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).