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*PL (permissible limits) (average daily intake in wet wt).
The U.S. Occupational Safety and Health Administration time-weighted average permissible exposure limit is 5 ppb and the ceiling limit is 20 ppb.
Epidemiologic health outcome and exposure studies were not used to develop the initial time-weighted average permissible exposure level of 2 μg/m.
In occupational settings, official agencies (OSHA, ACGIH, HSE, DFG) have established an 8-hour time-weighted average permissible exposure limit (TWA PEL) of 100 ppm (375 mg/m3 and 435 mg/m3 for toluene and xylene isomers, respectively).
The respirable airborne lead concentration during two-hour shooting sessions was between 0.2 and 1.7 mg/m3, although not directly comparable, were exceeding the Occupational Safety and Health Administration 8-h time-weighted-average permissible exposure limit (PEL) of 0.05 mg/m3.
The permissible concentration-time weighted average (PC-TWA) is the average permissible exposure level during the 8 h working day, weighted by time.
The U.S. Occupational Safety and Health Administration (OSHA) regulates PCE exposure in air with an 8-hour time-weighted average (TWA) permissible exposure level (PEL) of 100 ppm (678 mg/m) and a peak exposure limit of 300 ppm for no more than five minutes every three hours.
According to data of routine environmental monitoring in the years the cases occurred, the TCE levels in these workplaces ranged from 69 to 790 ppm (median concentration, 90 ppm), which is much higher than the permissible concentration time-weighted average of 5.6 ppm defined by the Ministry of Health, China (2002b).
The Occupational Safety and Health Administration OSHAA)(197) has set the STEL for formaldehyde at 2 ppm in 15 min and the permissible exposure limit time-weighted average (PEL-TWA) at 0.75 ppm.
Although a few studies found very different results, the airborne asbestos concentration for all industries studied ranged from 2.08 to 6.25 on average, exceeding the permissible exposure level (PEL) of 1 fibre/mL in 2006, now reduced to 0.15 fibre/mL, as announced by the Taiwan EPA (see Supplementary Table 1 in Supplementary Material available online at http://dx.doi.org/10.1155/2015/678598).org/10.1155/2015/678598
Water based cold energy storage system provides more compact size with short term storage (hours to days) and is potential for datacenters located in areas with yearly average temperature below the permissible cooling water temperature (∼25 °C).
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