#	Standard Interpretations
1	12/16/2021 - 1910.134(d)(1) - Respiratory protection against COVID-19 for employees with religiously mandated facial hair
2	08/05/2011 - 1910.134(d)(1) - OSHA's decision not to provide a religious exemption from the respirator standard.
3	07/18/2000 - 1910.134(d)(1)(i) - Selection of air purifying respirators for gases and vapors with poor warning properties (diisocyanates)
4	03/07/2003 - 1910.134(d)(1)(i) - Beards may not interfere with face seal;alternative respirators for bearded employees.
5	01/24/1991 - 1910.134(d)(1)(ii) - Use of non-approved respirators and improper use of approved respirators
6	07/01/1997 - 1910.134(d)(1)(ii) - NIOSH approved respirator during the period of an employee's escape from a chemical release of phosgene.
7	06/04/1990 - 1910.134(d)(1)(ii) - NIOSH eliminates maximum use concentrations (MUC) labeling requirement for Chemical Cartridges.
8	01/29/1999 - 1910.134(d)(1)(ii) - Using combinations of respiratory protection not approved by NIOSH.
9	10/01/1999 - 1910.134(d)(1)(ii) - Respirators for voluntary use and cleaning respirators during fit testing.
10	06/20/1997 - 1910.134(d)(1)(ii) - SCBA cylinder interchangeability.
11	01/17/2017 - 1910.134(d)(1)(ii) - OSHA requirements for respirator fit testing with and without facepiece accessories
12	04/24/2020 - 1910.134(d)(1)(ii) - Enforcement Guidance on Decontamination of Filtering Facepiece Respirators in Healthcare During the Coronavirus Disease 2019 (COVID-19) Pandemic
13	04/03/2020 - 1910.134(d)(1)(ii) - Enforcement Guidance for Respiratory Protection and the N95 Shortage Due to the Coronavirus Disease 2019 (COVID-19) Pandemic
14	03/14/2020 - 1910.134(d)(1)(ii) - Temporary Enforcement Guidance - Healthcare Respiratory Protection Annual Fit-Testing for N95 Filtering Facepieces During the COVID-19 Outbreak
15	05/14/2012 - 1910.134(d)(1)(iii) - Whether the Respiratory Protection standard requires personal air monitoring to identify and evaluate the respiratory hazards in the workplace.