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Homepage>ISO Standards>ISO 23431:2021-Measurement of road tunnel air quality-General information
download between 0-24 hoursReleased: 2021
ISO 23431:2021-Measurement of road tunnel air quality-General information

ISO 23431:2021

ISO 23431:2021-Measurement of road tunnel air quality-General information

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Standard´s number:ISO 23431:2021
Pages:31
Edition:1
Released:2021
DESCRIPTION

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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