# ISO 21501-4:2007 — Withdrawn and superseded ISO standards

For ISO 21501-4:2007, item title is Determination of particle size distribution — Single particle light interaction methods — Part 4: Light scattering airborne particle counter for clean spaces; status code is 9599; successor is ISO 21501-4:2018; withdrawn / published date is 2007-05-07, recorded from its source on 2026-08-05.

- **Identifier:** ISO 21501-4:2007 _(verified: appears in the quote below)_
- **Item title:** Determination of particle size distribution — Single particle light interaction methods — Part 4: Light scattering airborne particle counter for clean spaces _(verified: appears in the quote below)_
- **Status code:** 9599 _(verified: appears in the quote below)_
- **Successor:** ISO 21501-4:2018
- **Withdrawn / published date:** 2007-05-07 _(verified: appears in the quote below)_

## What the source says

> 40274,IS,,ISO 21501-4:2007,Determination of particle size distribution — Single particle light interaction methods — Part 4: Light scattering airborne particle counter for clean spaces,Détermination de la distribution granulométrique — Méthodes d'interaction lumineuse de particules uniques — Partie 4: Compteur de particules en suspension dans l'air en lumière dispersée pour espaces propres,2007-05-07,1,['19.120'],ISO/TC 24/SC 4,9599,[21709],[58073],['en'],16,"<p>ISO 21501-4:2007 describes a calibration and verification method for a light scattering airborne particle counter (LSAPC), which is used to measure the size and particle number concentration of particles suspended in air. The light s

## Source

- https://isopublicstorageprod.blob.core.windows.net/opendata/_latest/iso_deliverables_metadata/csv/iso_deliverables_metadata.csv

Last verified: 2026-08-05. Review by: 2027-02-01.
Part of [Withdrawn and superseded ISO standards](https://referencesource.org/iso-standard-supersessions/).