TLV BIOLOGICAL LIMIT VALUE
\tˌiːˌɛlvˈiː bˌa͡ɪəlˈɒd͡ʒɪkə͡l lˈɪmɪt vˈaljuː], \tˌiːˌɛlvˈiː bˌaɪəlˈɒdʒɪkəl lˈɪmɪt vˈaljuː], \t_ˌiː__ˌɛ_l_v_ˈiː b_ˌaɪ_ə_l_ˈɒ_dʒ_ɪ_k_əl l_ˈɪ_m_ɪ_t v_ˈa_l_j_uː]\
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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).
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