Standards New Zealand is seeking public comment on a draft joint standard on measurement of road tunnel air quality.
DR AS/NZS 3580.18:2016 – Methods for sampling and analysis of ambient air Method 18: Measurement of road tunnel air quality is out for public comment until 16 November 2016. The objective of this standard is to provide regulatory and testing bodies with standard methods for continuously monitoring air in road tunnels for air velocity, carbon monoxide (CO), nitric oxide (NO) and nitrogen dioxide (NO2) concentrations and visibility.
Road tunnel projects are subject to environmental and/or planning approval conditions by regulatory authorities that specify the parameters to be monitored in-tunnel, typically including air velocity, CO, NO, NO2, and visibility, with a requirement that the tunnel ventilation system be controlled to:
(a) prevent or reduce portal emissions and resultant environmental impacts
(b) ensure appropriate visibility for different tunnel operating conditions
(c) reduce public exposure to CO and NO2 concentrations within the tunnel, enabling compliance with criteria for various averaging periods.
The latter requirement is typically determined by averaging measured CO and NO2 concentrations from a number of instruments located on possible travel paths throughout the tunnel system.
View and make comment on DR AS/NZS 3580.18:2016 – Methods for sampling and analysis of ambient air Method 18: Measurement of road tunnel air quality