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ISO 23431:2021

Measurement of road tunnel air quality
19 mar 2021

General information

90.60     5 qer 2026

ISO

ISO/TC 146/SC 3

International Standard

13.040.20     93.060  

anglisht   frëngjisht  

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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.

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PUBLISHED
ISO 23431:2021
90.60 Close of review
5 qer 2026