Reference

Noise exposure is not the loudest reading of the day - it is a time-weighted average of every level a worker meets. This guide shows you how to calculate noise exposure: building an 8-hour TWA, computing dose with OSHA's 90 dBA PEL and 5 dB exchange rate, comparing it to the 85 dBA action level, and where the NIOSH 3 dB rate differs.

Most foam earplug failures are insertion failures, not product failures: a plug that is not rolled thin and held until it expands seals poorly and loses much of its rated protection. This guide walks through the roll-pull-hold method, shows how to check the seal, lists the common mistakes that ruin attenuation, and covers reusable plugs.

A decibel levels chart turns noise numbers into a clear picture of when hearing damage starts and when protection becomes mandatory. This guide charts common tools and environments by dBA, lays out the OSHA 1910.95 permissible exposure limits hour by hour, and shows how to convert a noise level into the right earplug or earmuff NRR.

NIOSH vs. OSHA Explained (2026 Guide): NIOSH (National Institute for Occupational Safety and Health) is a research and certification agency within the CDC that approves PPE and sets recommended exposure limits.