BS ISO 23431. Measurement of road tunnel air quality
|Standard number:||20/30382325 DC|
|Status:||Draft for Comment|
- 13.040.20 Ambient atmospheres
- 93.060 Tunnel construction
This Standard describes methods for determining air speed and flow direction, carbon monoxide (CO), nitric oxide (NO) and nitrogen dioxide (NO2) concentrations and visibility in road tunnels using direct-reading instruments. This Standard specifically excludes requirements relating to instrument conformance testing.