The RTA is committed to researching and reporting on air pollutants along RTA roads. This commitment was demonstrated by RTA's participation in the International Workshop on Tunnel Ventilation, 7 - 9 June 2000, held in Sydney, Australia. This workshop was held to discuss the management of vehicle emissions from road tunnels.
Norway and Japan are the acknowledged world leaders in the construction and operation of road tunnels. Study tours have been undertaken in Norway and Japan, with a review of international developments in emission treatment systems in road tunnel applications also commissioned in 2004. Reports from those studies are available below.