# ISO 1999:1990 — Withdrawn and superseded ISO standards

For ISO 1999:1990, item title is Acoustics — Determination of occupational noise exposure and estimation of noise-induced hearing impairment; status code is 9599; successor is ISO 1999:2013; withdrawn / published date is 1990-01-18, recorded from its source on 2026-08-05.

- **Identifier:** ISO 1999:1990 _(verified: appears in the quote below)_
- **Item title:** Acoustics — Determination of occupational noise exposure and estimation of noise-induced hearing impairment _(verified: appears in the quote below)_
- **Status code:** 9599 _(verified: appears in the quote below)_
- **Successor:** ISO 1999:2013
- **Withdrawn / published date:** 1990-01-18 _(verified: appears in the quote below)_

## What the source says

> 6759,IS,,ISO 1999:1990,Acoustics — Determination of occupational noise exposure and estimation of noise-induced hearing impairment,Acoustique — Détermination de l'exposition au bruit en milieu professionnel et estimation du dommage auditif induit par le bruit,1990-01-18,2,['13.140'],ISO/TC 43/SC 1,9599,[6758],[45103],"['en','fr']",17,"<p>Prescribes a practical relation for these quanitities expressed as A-weighted noise level in dB and duration of exposure within a normal working week (40 hours) and the percentage of personnel that is to be expected to obtain a raised hearing threshold of 25 dB or more as a result of this exposure, averaged from 500, 1000 and 2000 Hz.</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Part of [Withdrawn and superseded ISO standards](https://referencesource.org/iso-standard-supersessions/).