# NIOSH air filtration rating

> rating system for respirators designed to protect against contaminated air particles

**Wikidata**: [Q23582148](https://www.wikidata.org/wiki/Q23582148)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/NIOSH_air_filtration_rating)  
**Source**: https://4ort.xyz/entity/niosh-air-filtration-rating