ACGIH Governmental Industrial Hygienists

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). 

TEJCs Threshold Eimit Values and Biological Exposure Indices, American Conference of Governmental Industrial Hygienists (ACGIH), Cincinnati, Ohio, 1990-1991. 

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... 

ACGIH, Documentation of the Threshold Eimit Haluesfor Substances in Workroom Fiir, American Conferences of Governmental Industrial Hygienists, 1977. 

Toxicity. 1,1-Dichloroethane, like all volatile chlorinated solvents, has an anesthetic effect and depresses the central nervous system at high vapor concentrations. The 1991 American Conference of Governmental Industrial Hygienists (ACGIH) recommends a time-weighted average (TWA) solvent vapor concentration of 200 ppm and a permissible short term exposure level (STEL) of 250 ppm for worker exposure. The oral LD q of... 

American Conference of Governmental Industrial Hygienists (ACGIH), Documentation of Threshold Limit Values, 3rd ed. 1971, pp. 16 and 245-246 F. A, Patty in Industrial Hygiene and Toxicology, Interscience Publishers, New York, Vol. II, 2nd ed., 1963, Chap. 24. 

American Conference of Governmental Industrial Hygienists (2000) Threshold Limit Values for Chemical Substances in the Work Environment, ACGIH, Cincinnati. 

Over the years, various individuals proposed different limits, and some states, as well as, and the American Conference of Governmental Industrial Hygienists (ACGIH) began to develop limits or standards. In 1945, W. A. Cook compiled a list of concentration limits for 150 substances. The ACGIH adopted this list and developed an active program which continues to this day. 

ACGIH American Conference of Governmental Industrial Hygienists... 

ACGIH American Conference of Governmental Industrial Hygienists, http //www.acgih.org/ This wch site onnects with a number of publications soine of which are listed below. 

According to the ACGIH (American Conference of Governmental Industrial Hygienists, USA), variations in worker exposure levels may exceed three times the OEL-TWA for no more than a total of 30 minutes during a workday, and under no circumstances should they exceed five times the TWA. 

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