On September 25, 2019, OSHA issued a final rule approving two additional quantitative fit testing protocols for inclusion in appendix A of the Respiratory Protection Standard. These protocols are:

1. The modified ambient aerosol condensation nuclei counter (CNC) quantitative fit testing protocol for full-facepiece and half-mask elastomeric respirators; and
2. The modified ambient aerosol CNC quantitative fit testing protocol for filtering facepiece respirators.

Both protocols are variations of the original OSHA-approved ambient aerosol CNC protocol, but have fewer test exercises, shorter exercise duration, and a more streamlined sampling sequence. The new rule became effective September 26, 2019.
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