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ISO 23431:2021
M00000469
New product
ISO 23431:2021 Measurement of road tunnel air quality
standard by International Organization for Standardization, 03/01/2021
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Full Description
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.