Article 7 2

2.   Member States shall review the classification referred to in paragraph 1 at least every 5 years in accordance with the procedure laid down in paragraph 3. However, classifications shall be reviewed more frequently in the event of significant changes in activities impacting the ambient concentrations of sulphur dioxide, nitrogen dioxide and oxides of nitrogen, particulate matter (PM10 and PM2,5), benzene, carbon monoxide, arsenic, cadmium, lead, nickel, benzo(a)pyrene or ozone.