#	Federal Register
1	07/01/2025 - 1910.134(c)(2) - 90:28277-28282 - Lead
2	07/01/2025 - 1910.134(c)(2) - 90:28330-28335 - Cadmium
3	06/21/2021 - 1910.134(c)(2) - 86:32376-32628 - Occupational Exposure to COVID-19; Emergency Temporary Standard; Interim Final Rule
4	06/21/2021 - 1910.134(c)(2), 1910.134(c)(2)(i), 1910.134(c)(2)(ii) - 86:32376-32628 - Occupational Exposure to COVID-19; Emergency Temporary Standard; Interim Final Rule

#	Letters of Interpretation
1	04/26/2018 - 1910.134(c)(2) - Voluntary use respirators
2	04/24/2018 - 1910.134(c)(2) - Filtering facepiece respirators and medical evaluations
3	11/22/2011 - 1910.134(c)(2) - Numerous questions on filtering facepiece/dusk mask respirators.
4	08/11/2010 - 1910.134(c)(2) - Use of smoke escape hoods meeting the ANSI-ISEA standard
5	02/06/2006 - 1910.134(c)(2)(ii) - Facial hair and voluntary use of filtering facepiece respirators.
6	10/01/1999 - 1910.134(c)(2) - Respirators for voluntary use and cleaning respirators during fit testing.

#	Regulations
1	04/20/2006 - - Respiratory protection.