The American Conference of Governmental Industrial Hygienists (ACGIH) has announced its Notice of Intended Changes (NIC) for Threshold Limit Values (TLV) and Short-Term Exposure Limits (STEL) for 2023. Although the United States uses OSHA’s Permissible Exposure Limits (PEL), the rest of the world, including Canada, uses TLVs. NICs do not mean TLVs will definitely change. ACGIH can either adopt them, remove them or keep them listed as NIC for the following year.

This year’s important NICs include:

Current TLV – 0.5PPM NIC TLV – 0.02PPM
Current STEL – 2.5PPM NIC STEL – 0.1PPM
Ethylene glycol dimethyl ether
Current TLV – none NIC TLV – 0.5PPM
Formic Acid
Current STEL – 10PPM NIC STEL – none
Current TLV – 200PPM NIC TLV – 75 PPM
Current STEL – 300PPM NIC STEL – 150 PPM
Nitric acid

Current STEL – 4 PPM

NIC STEL – 0.025 PPM as inhalable fraction and vapor (IFV)


If your company deals with these potential new (lower) exposure limits, we are here to assist you in meeting them. For questions on our services or to order, contact our award-winning Client Service Representatives:


We are SGS – the world’s leading testing, inspection and certification company.

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