ISO 4225:2020

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ISO 4225:2020 is an international standard that defines terms related to air quality. It's applicable to all ISO standards, technical reports, technical specifications, and guides related to air quality. 

This document specifies terms and definitions that are related to air quality (see 3.1. 1.1). These are either general terms or are used in connection with the sampling (see 3.3. 3.1) and measurement of gases, vapours (see 3.1. 5.8) and airborne particles (see 3.2.