ECCO NOxCAT

Road traffic is one of the main reasons for nitrogen oxide pollution. NO_x consists mainly of NO and NO₂.

For human health, primarily NO₂ is relevant. Reduction of the particle emission of diesel engines, however, led to increased emission of NO₂, and today NO₂ amounts to 20 – 40 % of all NO_x.

So this is an important reason why in the planning of tunnel projects – particularly for tunnels in cities – filtration not only of particles but also of NO₂ should be considered!

For very long road tunnels, a bypass solution, e.g. cleaning of the air and return into the tunnel, will be an economic solution compared to air exchange. Here, too, it may be sensible to reduce NO₂ in order to keep pollutant concentrations for the drivers as low as possible.