ISO 23431:2021

Current Revision
Measurement of road tunnel air quality

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ISO 23431:2021

Measurement of road tunnel air quality

PUBLISH DATE 2021
ISO 23431:2021

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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