The Noise Reduction Ratings (NRRs) that are emblazoned on all hearing protection devices that we buy and recommend are governed by a 1979 Hearing Protector Labeling Regulation promulgated under the auspices of the Environmental Protection Agency (EPA). That elderly rule has many shortcomings, not the least of which is the fact that labeled NRRs bear little resemblance to what groups of users can expect to obtain in actual hearing conservation programs. Unfortunately the EPA's Noise Office has been essentially out of business since shortly after the regulation was promulgated and thus has been unable to consider revising and updating that regulation. Much has been learned in the intervening 24 years.
That situation may be rectified. In a surprising move, EPA announced in early March that they would host a workshop on revising the regulation in Washington in late March. For a summary of the lectures and workshop activities click the link below.