Article 2.5.2.2.1.

1.

The upper and lower assessment thresholds stated in Appendix 2.5.3.2, Part A apply to sulphur dioxide, nitrogen dioxide and nitrogen oxides, particulate matter (PM10 and PM2.5), lead, benzene and carbon monoxide.

Each zone and agglomeration is subdivided on the basis of the assessment thresholds.

2.

The classification stated in paragraph 1 shall be reviewed at least every five years according to the procedure stated in Appendix 2.5.3.2, Part B.

The subdivision shall be reviewed more frequently if there are significant changes in the activities that are relevant for the concentrations of sulphur dioxide, nitrogen dioxide or, if applicable, nitrogen oxides, particulate matter (PM10 and PM2.5), lead, benzene or carbon monoxide.