ISO 4225:2020 pdf download

ISO 4225:2020 pdf download

ISO 4225:2020 pdf download.Air quality — General aspects — Vocabulary
1 Scope
This document specifies terms and definitions that are related to air quality (see These are either general terms or are used in connection with the sampling (see and measurement of gases, vapours (see and airborne particles (see for the determination of air quality. The terms included are those that have been identified as being fundamental because their definition is necessary to avoid ambiguity and ensure consistency of use. An alphabetical index of the terms is provided in Annex A. This document is applicable to all International Standards, ISO Technical Reports, ISO Technical Specifications, and ISO Guides related to air quality.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at http:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1 General terms
3.1.1 Terms describing air quality air quality
features of the air which have an impact on humans (e.g., safety and health) and/or the environment
Note 1 to entry: Air quality is typically expressed in terms of the presence or absence of air pollution ( (e.g.emissions ( or conversions resulting from emissions, e.g., ozone), using one or more measurements.
Note 2 to entry: The concept of air quality can be used in reference to ambient air (, indoor air (, or workplace air ( air quality standard
specified attribute of the air intended to prevent or minimize impacts on humans (e.g. safety and health) and/or the environment
Note 1 to entry: Air quality standards are frequently defined statistically by setting a limit to the concentration of an air pollutant ( over a specified averaging time (
Note 2 to entry: Air quality standards can have legal or advisory status in one or more jurisdictions. ambient air
outdoor air to which people, plants, animals or material can be exposed ambient air quality standard
air quality standard ( for the ambient air ( indoor air
air within an enclosed space, e.g., dwelling or public building indoor air quality standard
air quality standard ( for the indoor air ( workplace air
air to which a person is exposed, whether indoor or outdoor, during the hours of work at the person’s workplace workplace air quality standard
air quality standard ( for the workplace air ( averaging time
interval of time over which an attribute of air quality ( has been expressed as an average