ISO 23431:2021
Current
Current
The latest, up-to-date edition.
Measurement of road tunnel air quality
Available format(s)
Hardcopy , PDF , PDF 3 Users , PDF 5 Users , PDF 9 Users
Language(s)
English, French
Published date
19-03-2021
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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