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ISO 23431:2021

Measurement of road tunnel air quality ISO 23431:2021

Publication date:   Mar 19, 2021

General information

90.60   Close of review   Jun 5, 2026

ISO

ISO/TC 146/SC 3 Ambient atmospheres

International Standard

13.040.20   Ambient atmospheres | 93.060   Tunnel construction

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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

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PUBLISHED
ISO 23431:2021
90.60 Close of review
Jun 5, 2026




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