ISO 23431:2021
International Standard
Current Edition
·
Approved on
19 March 2021
Measurement of road tunnel air quality
ISO 23431:2021 Files
English
31 Pages
Current Edition
OMR
75.67
ISO 23431:2021 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.
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