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2. List of highly toxic gases - Wikipedia

   en.wikipedia.org/wiki/List_of_highly_toxic_gases

   Many gases have toxic properties, which are often assessed using the LC 50 (median lethal concentration) measure. In the United States, many of these gases have been assigned an NFPA 704 health rating of 4 (may be fatal) or 3 (may cause serious or permanent injury), and/or exposure limits (TLV, TWA/PEL, STEL, or REL) determined by the ACGIH professional association.

3. Threshold limit value - Wikipedia

   en.wikipedia.org/wiki/Threshold_limit_value

   Threshold limit value − ceiling limit (TLV-C): An absolute exposure limit that should not be exceeded at any time. There are TLVs for physical agents as well as chemical substances. TLVs for physical agents include those for noise exposure, vibration, ionizing and non-ionizing radiation exposure and heat and cold stress.

4. American Conference of Governmental Industrial Hygienists

   en.wikipedia.org/wiki/American_Conference_of...

   This ACGIH peer-reviewed journal provided scientific information and data to members until ACGIH and AIHA began publishing a joint journal. [5] The Journal of Occupational and Environmental Hygiene (JOEH) is a joint publication of the American Industrial Hygiene Association (AIHA) and ACGIH. JOEH is a peer-reviewed journal devoted to enhancing ...

5. Permissible exposure limit - Wikipedia

   en.wikipedia.org/wiki/Permissible_exposure_limit

   Threshold Limit Values (TLVs), often determined by the American Conference of Governmental Industrial Hygienists (ACGHI), is a key component in determining the PEL. [11] [10] Other things that contribute to determining the PEL are toxicity and particle size. [10] PELs for chemicals are measured in mg/M 3 (milligrams per cubic meter). [2]

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7. Occupational dust exposure - Wikipedia

   en.wikipedia.org/wiki/Occupational_dust_exposure

   This may include eliminating a dust generating agent, or simply replacing a highly toxic agent with a safer one. Engineering controls such as wet methods, dust collectors, and improved HVAC systems can also be highly protective. Administrative measures such as shift rotations can also help reduce personal exposures to acceptable levels.