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immediate downloadReleased: 2021-03-23
BS ISO 23431:2021 Measurement of road tunnel air quality

BS ISO 23431:2021

Measurement of road tunnel air quality

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Standard number:BS ISO 23431:2021
Pages:40
Released:2021-03-23
ISBN:978 0 539 02111 0
Status:Standard
DESCRIPTION

BS ISO 23431:2021


This standard BS ISO 23431:2021 Measurement of road tunnel air quality is classified in these ICS categories:
  • 93.060 Tunnel construction
  • 13.040.20 Ambient atmospheres

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.