# ISO 21501-1:2009 — Withdrawn and superseded ISO standards

For ISO 21501-1:2009, item title is Determination of particle size distribution — Single particle light interaction methods — Part 1: Light scattering aerosol spectrometer; status code is 9599; successor is ISO 21501-1:2025; withdrawn / published date is 2009-05-22, recorded from its source on 2026-08-05.

- **Identifier:** ISO 21501-1:2009 _(verified: appears in the quote below)_
- **Item title:** Determination of particle size distribution — Single particle light interaction methods — Part 1: Light scattering aerosol spectrometer _(verified: appears in the quote below)_
- **Status code:** 9599 _(verified: appears in the quote below)_
- **Successor:** ISO 21501-1:2025
- **Withdrawn / published date:** 2009-05-22 _(verified: appears in the quote below)_

## What the source says

> 42728,IS,,ISO 21501-1:2009,Determination of particle size distribution — Single particle light interaction methods — Part 1: Light scattering aerosol spectrometer,Détermination de la distribution granulométrique — Méthodes d'interaction lumineuse de particules uniques — Partie 1: Spectromètre d'aérosol en lumière dispersée,2009-05-22,1,['19.120'],ISO/TC 24/SC 4,9599,,[81877],['en'],27,"<p>ISO 21501-1:2009 specifies characteristics of a light scattering aerosol spectrometer (LSAS) which is used for measuring the size, number concentration and number/size distribution of particles suspended in a gas. The light scattering technique described in this document is based upon single particle measur

## 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Part of [Withdrawn and superseded ISO standards](https://referencesource.org/iso-standard-supersessions/).