Reference number
ISO 23431:2021
© ISO 2024
International Standard
ISO 23431:2021
Measurement of road tunnel air quality
Edition 1
2021-03
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Published (Edition 1, 2021)

ISO 23431:2021

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Format
CHF 151
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Abstract

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.

General information

  • Status
     : Published
    Publication date
     : 2021-03
    Stage
    : International Standard published [60.60]
  • Edition
     : 1
    Number of pages
     : 31
  • Technical Committee :
    ISO/TC 146/SC 3
    ICS :
    93.060  13.040.20 
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