For the application of the second paragraph of I of article L. 2213-4-1, land transport is considered to be the cause of a preponderant proportion of limit value exceedances:
1° Either when land transport is the main source of pollutant emissions;
2° Or when the locations affected by the exceedance are mainly located near road traffic routes.
For the application of 1°:
where the limit value for nitrogen dioxide (NO2) is exceeded, the emissions to be taken into account are those of nitrogen oxides (NOx);
emissions are assessed for the territory of the atmospheric protection plan defined in the article L. 222-4 of the Environment Code, the public establishment for intercommunal cooperation with its own tax status or the commune concerned.