# ISO 226:1987 — Withdrawn and superseded ISO standards

For ISO 226:1987, item title is Acoustics — Normal equal-loudness level contours; status code is 9599; successor is ISO 226:2003 | ISO/WD 226; withdrawn / published date is 1987-05-07, recorded from its source on 2026-08-05.

- **Identifier:** ISO 226:1987 _(verified: appears in the quote below)_
- **Item title:** Acoustics — Normal equal-loudness level contours _(verified: appears in the quote below)_
- **Status code:** 9599 _(verified: appears in the quote below)_
- **Successor:** ISO 226:2003 | ISO/WD 226
- **Withdrawn / published date:** 1987-05-07 _(verified: appears in the quote below)_

## What the source says

> 4100,IS,,ISO 226:1987,Acoustics — Normal equal-loudness level contours,Acoustique — Lignes isosoniques normales,1987-05-07,1,['13.140'],ISO/TC 43,9599,[4099],"[34222,30173]","['en','fr']",8,<p>Specifies the relations existing between the sound pressure levels and frequencies of pure sinusoidal continuous tones in several conditions. These relations are expressed as curves and represent a fundamental property of the human auditory system.</p>

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Part of [Withdrawn and superseded ISO standards](https://referencesource.org/iso-standard-supersessions/).