The Directive on Ambient Air Quality Assessment and Management requires the

establishment of limit values and/or alert thresholds. When setting the limit values

and, if appropriate, an alert threshold, the following factors may be taken into account:

· the degree of exposure of sectors of the population, and in particular sensitive

groups;

· climatic conditions;

· sensitivity of flora and fauna and other habitats;

· historic heritage exposed to pollutants;

· economic and technical feasibility;

· long-range transport of pollutants, and secondary pollutants, including ozone.

Consideration must be given to the total impact of nitrogen oxides emissions on

human health, materials and ecosystems from different nitrogen oxide compounds and

other secondary pollutants, e.g. O3.

 

 

 

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