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ISO 23431:2021

Measurement of road tunnel air quality

Mar 19, 2021

General information

90.20     Jan 15, 2026

ISO

ISO/TC 146/SC 3

International Standard

13.040.20     93.060  

English   French  

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Scope

This document describes methods for determining air speed and flow direction, CO, NO and NO2 concentrations and visibility in road tunnels using direct-reading instruments. This document specifically excludes requirements relating to instrument conformance testing.

Life cycle

NOW

PUBLISHED
ISO 23431:2021
90.20 Standard under periodical review
Jan 15, 2026

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