This content has been archived on 04 Sep 2014, reason:
(New version data-and-maps/figures/nitrogen-oxide-annual-limit-value-for-the-protection-of-vegetation was published)
In the air quality directive (2008/EC/50), the EU has set a critical level for nitrogen oxides (NOx) for the protection of vegetation within the zones designated by member states: the NOx annual mean value may not exceed 30 micrograms per cubic metre (µg/m3).
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If getting there by car, instead of by train or bus, be generous and share the space. By taking other people who might have made their journey in a separate car, you're putting one less car on the road.
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