Post History

Current testing is "is based upon idealized laboratory testing, the NRR can overestimate the protection"

There is some talk about changing the rating system, but in a quick search I don't find anything recent.  

Some sources recommend wearing dual protection 'earmuffs and plugs' because the rating on the product, is **NOT** tested for impulse noises like gun shots. 


References
* [New Proposed EPA Noise Reduction Rating](https://www.grainger.com/content/safety-epa-noise-reduction-rating)
* [High-level impulse sounds. How well will your hearing protector perform?](https://www.ishn.com/articles/97659-high-level-impulse-sounds)