ker je zlasti za varovanje zdravja ljudi in okolja potrebno določiti mejno vrednost zadušikov dioksid, ki ne sme biti presežena na ozemlju držav članic v določenem obdobju in ker naj ta vrednost temelji na rezultatih dela Svetovne zdravstvene organizacije, posebno glede razmerja doza/učinek, predvidenega za to onesnaževalo;
Whereas, in order to protect in particular human health and the environment, it is necessary to set for nitrogen dioxide a limit value which must not be exceeded in the territory of the Member States during specified periods and whereas this value should be based on the results of work carried out for the World Health Organization, particularly with regard to the dose/effect relationships established for this pollutant;