Measurement of road tunnel air quality (ISO 23431:2021, IDT)
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SS-ISO 23431:2021
Measurement of road tunnel air quality (ISO 23431:2021, IDT)
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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.
Measurement of road tunnel air quality (ISO 23431:2021, IDT)
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