The National Institute for Occupational Safety and Health (NIOSH) enacted a significant update to its air filtration ratings with the introduction of 42 CFR 84, marking a pivotal moment in respiratory protection standards. This regulation, published in the Federal Register, established the N95 respirator standard, providing a clear framework for the testing and certification of respiratory protective devices. The N95 respirator is designed to achieve a minimum filtration efficiency of 95% against certain non-oily particles, making it a crucial tool in protecting workers in environments where exposure to airborne contaminants could pose serious health risks.

The new regulation not only redefined the criteria for respirators but also introduced a comprehensive labeling system that improved user understanding. By aligning the certification process more closely with users' needs, NIOSH aimed to ensure that the right equipment was available to those in high-risk occupations, including healthcare, mining, and construction. The updated standards reflected ongoing advancements in scientific research regarding airborne exposure and respirator efficacy, underscoring NIOSH’s adaptability in response to emerging public health concerns.

As workers began to regularly use N95 respirators in their daily routines, the implementation of 42 CFR 84 ultimately led to enhanced workplace safety and reductions in respiratory illnesses. This regulation can be seen as a precursor to future developments in personal protective equipment, setting a foundation for ongoing improvements in workplace standards and health outcomes.