BS ISO 4225:2020 pdf free.Air quality一General aspects一Vocabulary.
BS ISO 4225 This document specifies terms and definitions that are related to air quality (see 3.11.1). 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 3.2.2.1) 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 AnnexA.
This document is applicable to all International Standards, ISO Technical Reports, ISO Technical Specifications, and IS0 Guides related to air quality.This document specifies terms and definitions that are related to air quality (see 3.11.1). 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 3.2.2.1) 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  nnexA. This document is applicable to all International Standards, ISO Technical Reports, ISO Technical Specifications, and IS0 Guides related to air quality.result of reactions in the atmosphere between nitrogen oxides, organic compounds and oxidants under
the influence of sunlight, leading to the formation of oxidizing compounds or possibly causing poor visibility, eye irritation or damage to material and vegetation if sufficiently concentratedNote 1 to entry: As used in this definition, the word “undisturbed” applies in the area of workplace air (3.11.Z) to ideal laboratory conditions where the presence of the sampler (3.3.2.10) and the body onto which it is mounted do not disturb the determination of the reference concentration. The word “undisturbed” does not refer to movement of the air itself. Note 2 to entry: For an aerosol sampler (3.3.2.15) with internal separation, e.g. size-selective sampling, the sampling fficiency (3.3.2.16) is the product of the inlet eficiency and the interna penetration. 3.3.2.17 mixed-phase sampler sampler (3.3.2.10) or sampling train (3.3.2.19) that is used to collect airborne particles (3.2.2.1) and vapours (3.1.5.8) onto one or more collection  bstrates (3.3.3.Z) BS ISO 4225 pdf download.