Recommended exposure levels

Health and Safety. Both N-methylpyrrohdinone and dibasic esters have very low vapor pressure which limits worker exposure to vapors. Manufacturers recommend that the same safety precautions be taken as with other organic solvents. Ha2ardous location requirements must be considered if the formula is flammable. Ventilation that reduces vapors to manufacturer s recommended exposure levels should be used. 

Pretreatment Standards for New Sources recommended exposure level/limit Reference Concentration Reference Dose ribonucleic acid... 

Recommended Dietary Allowance (RDA), 17 652 25 784-787 of ascorbic acid, 25 772 defined, 25 784 for vitamins, 25 785t Recommended exposure level (REL), hydrazine, 13 590... 

Pretreatment Standards for New Sources REL = Recommended Exposure Level RfD = Reference Dose TLV = Threshold Limit Value TPQ = Threshold Planning Quantity TWA = Time- Weighted Average WHO =... 

REL Recommended Exposure Level average concentration limit recommended for up to a 10-hour workday during a 40-hour workweek, by NIOSH. 

Organization Type of Exposure Level Recommended Exposure Level Reference... 

For occupational exposures, Permissible Exposure Levels (PELs), Threshold Limit, Values (TLVs), and NIOSH Recommended Exposure Levels (RELs) are developed. They represent dose levels that will not produce adverse health effects from repeated daily exposures in the workplace. The method used to derive them is conceptually the same. Safety factors are used to derive the PELs, TLVs, and RELs. 

As shown in Table 3, the biological effect of exposure to nuclear radiation can be expressed in rem. Healthcare professionals are advised to limit their exposure to 5 rem per year. This exposure is 1000 times higher than the recommended exposure level for most people, including you. Other units of radiation measurement can be seen in Table 4. 

The (US) National Institute for Occupational Safety and Health (NIOSH) recommended exposure level (REL), averaged over a lOh workday is 0.005 ppm (0.035 mgm ). 

The ACGIH threshold limit value, 8 h time-weighted average (TWA), is 50 ppm, and the US National Institute for Occupational Safety and Health recommended exposure level is 25 ppm as a TWA during the period of anesthetic administration. 

The American Conference of Governmental Industrial Hygienists threshold limit value, 8 h time-weighted average (TWA) is 0.2mgm for coal tar pitch volatiles, as is the (US) Occupational Safety and Health Administration permissible exposure limit, 8 h TWA. The (US) National Institute for Occupational Safety and Health (NIOSH) recommended exposure level, averaged over a 10 h workday, is 0.1 mg m for coal tar pitch volatiles. Further, NIOSH considers coal tar... 

Part IV is devoted to regulatory requirements for toxic chemical warnings for chemicals and chemical products and the need to adjust recommended exposure levels for products containing chemical mixtures. This part also contains suggestions for limiting mixture exposures in the products we use and recommendations for limiting environmental exposures to toxic chemical mixtures. 

OSHA = Occupational Safety and Health Administration OSW = Office of Solid Waste OTS = Office of Toxic Substances OWRS = Office of Water Regulations and Standards PEL = Permissible Exposure Level PIC = Products of Incomplete Combustion REL = Recommended Exposure Level SIP = State Implementation Plan SNARL = Suggested No Adverse Response Level STEL = Short-term Exposure Limit TLV = Threshold Limit Value TWA = Time-Weighted Average ... 

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