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ISO 23431:2021

Measurement of road tunnel air quality

General information
Valid from 19.03.2021
Directives or regulations
None
Standard history
Status
Date
Type
Name
19.03.2021
Main
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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Standard monitoring