OSHA issued a Notice of Proposed Rulemaking to add two quantitative fit-testing protocols to the agency’s Respiratory Protection Standard. The protocols would apply to employers in the general, shipyard and construction industries. Appendix A of the standard contains mandatory respirator fit-testing methods that employers must use to ensure their employees’ respirators fit properly and protect the wearer. The standard also allows individuals to submit new fit-test protocols for OSHA approval. The existing standard contains mandatory testing methods to ensure that employees’ respirators fit properly and are protective. The proposed protocols are variations of the existing OSHA-accepted PortaCount® protocol, but differ from it by the exercise sets, exercise duration, and sampling sequence.
Further info from OSHA here.