Welcome on piarc.org!

PIARC (World Road Association), founded in 1909 and comprising 125 member governments from all over the world, is the global forum for exchange of knowledge and experience on roads, road transport policies and practices. With consultative status to the Economic and Social Council of the United Nations, the Association is contributing to a stable and sustainable global development of the road and transport sector.

This site uses cookies to optimize its operation. They allow you to securely access your personal space and download our publications. You accept their use by clicking on the "Accept" button.

Road tunnels: vehicle emissions and air demand for ventilation

This report presents the data necessary for the design of the ventilation system for road tunnels in normal operation. It aims at defining the minimum quantity of fresh-air that is required to ensure adequate in-tunnel air quality and visibility thresholds. This report is a reference document for the design of tunnels and for monitoring the operation conditions.

The report provides the values of admissible concentrations of toxic gases and particulate matter. It then presents the emission factors of the main pollutants and particulate matter as a function of the type of vehicle and of traffic conditions.

The report takes into account the change in legislation which enforces more stringent emissions factors and also changes in vehicle technology. In appendix, emission factors specific to some countries are presented together with the emission factors for the Euro standards.

With this up-date of the data, this report completely replaces the previous one, published under the same title in 2004 under the reference 05.14.B

Information sheet

  • Date: 2012
  • Author(s): Comité technique AIPCR C.4 Exploitation des tunnels routiers / PIARC Technical Committee C.4 Road Tunnel Operation
  • Domain(s): Environment / Road Tunnel Operations
  • Type: Technical report 2012R05EN
  • PIARC Ref.: 2012R05EN
  • ISBN: 978-2-84060-269-5
  • Number of pages: 87