Specify concentration limits and exposure times for constituents of mixtures based on
threshold limit values (TLV), for instance, or reference exposure limits (REL) as shown later.
The elements or oxides listed in table 1 correspond to the ACGIH categories located in [TLV
Threshold Limit Values for Chemical Substances and physical Agents in the Workroom Environment].
The overall mean respirable dust was 3.28+-1.38 mgm-3 which is higher than
Threshold Limit Value (TLV) recommended by American Conference of Governmental Industrial Hygienists (ACGIH) for respirable particles not otherwise classify.10 The maximum mean respirable tobacco dust concentration was found in threshing location (3.44 mgm-3) and the minimum mean con-centration was 2.93 mgm-3 in stems feeder location (the only location that the mean respirable dust con-centration was lower than TLV).
Documentation of
Threshold Limit Values and Biological Exposure Indices, 7th ed.
Hence, the
threshold limit value over a time-weighted average (TLV-TWA) for formaldehyde is the time-weighted average concentration for an 8-hour day and a 40-hour workweek to which workers may be repeatedly exposed without adverse effect.
That's when the American Conference of Governmental Industrial Hygienists recommended a 1mg/[m.sup.3]
threshold Limit value (an 8-hour, time-weighted average) for most wood dust species based on its review of both cancerous and non-cancerous health effects.
The overall geometric mean of silica exposure levels for 8-hr personal TWA samples collected during programmed inspections was 0.077 mg/[m.sup.3], well above the applicable American Conference of Governmental Industrial Hygienists
threshold limit value of 0.05 mg/[m.sup.3].
The BEI is a biomarker that correlates to the American Conference of Governmental Industrial Hygienists' 8-hour
threshold limit value (ACGIH TLV) of 50 ppm (3).
Flammability: high Toxicity: moderate
Threshold Limit Value: 400 ppm Cost: moderate Flash Point 53-61 |degrees~F (91-99% purity) Evaporation Rate: moderate Burning Characteristics: clean flame (no smoke), does not burn excessively hot
The odor threshold is 0.004 mg/[m.sup.3], the American Conference of Governmental Industrial Hygienists (ACGIH)
threshold limit value ceiling (TLV-C) is 0.39 mg/[m.sup.3], the NIOSH recommended exposure limit ceiling (REL-C) is 0.40 [micro]g/ [m.sup.3], and the concentration NIOSH deems immediately dangerous to life and health (IDLH) is 2.0 [micro]g/[m.sup.3] (American Conference of Governmental Industrial Hygienists [ACGIH], 2008; NIOSH, 2007).
The American Conference of Governmental Industrial Hygienists defines a concentration of 0.025 mg/[m.sup.3] as the
threshold limit value (OSHA 2004) for an 8-hr time-weighted average limit for toxic exposure.
The American Conference of Governmental Industrial Hygienists has issued a Notice of Intended Changes to its
Threshold Limit Value for wood dust.