American Conference of Governmental Industrial Hygienists

Threshold Emit Values andBiological Exposure Indices for 1989—1990, American Conference of Governmental Industrial Hygienists, Cincinnati, Ohio, 1989. 

The OSHA permissible exposure limit (11) and the American Conference of Governmental Industrial Hygienists (ACGIH) estabHshed threshold limit value (TLV) (12) for fluorides is 2.5 mg of fluoride per cubic meter of air. This is the TLV—TWA concentration for a normal 8-h work day and a 40-h work week. 

Formaldehyde is classified as a probable human carcinogen by the International Agency for Research on Cancer (lARC) and as a suspected human carcinogen by the American Conference of Governmental Industrial Hygienists (ACGIH). This is based on limited human evidence and on sufficient evidence in experimental animals (136). Lifetime inhalation studies with rodents have shown nasal cancer at formaldehyde concentrations that overwhelmed cellular defense mechanisms, ie, 6 to 15 ppm. No nasal cancer was seen at 2 ppm or lower levels (137). 

American Conference of Governmental Industrial Hygienists, Threshold Eimit Values for Chemical Substances and Physical Agents in the Work Environment with Intended Changes for 1993 —1994, ACGIH, 1991, P.O. Box 1937, Cincinnati, Ohio, 45201. 

American Conference of Governmental Industrial Hygienists P.O. Box 1937 Cincinnati, Ohio 45201 Practices, analytical methods, guides to codes and/or regulations, threshold limit values. 

The 1994—1995 threshold limit values as recommended by the American Conference of Governmental Industrial Hygienists (ACGIH) are given in Table 8. These time-weighted average values are those levels to which nearly all workers may be exposed for an 8-h workday and a 40-h work week without adverse effect (99). 

The U.S. Department of Labor (OSHA) has ruled that an employee s exposure to aniline in an 8-h work shift of a 40-h work week shaU not exceed an 8-h time-weighted average (TWA) of 5 ppm vapor in air. The American Conference of Governmental Industrial Hygienists (ACGIH) recommends a... 

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