1. The operator shall regularly check whether the monitoring methodology plan reflects the nature and functioning of the installation and whether it can be improved. To this end, the operator shall take account of any recommendations for improvements included in the relevant verification report.

2. The operator shall modify the monitoring methodology plan in any of the following situations:

(a) new emissions or activity levels occur due to new activities carried out or due to the use of new fuels or materials not yet contained in the monitoring methodology plan;

(b) the use of new measuring instrument types, new sampling or analysis methods or new data sources, or other factors, lead to higher accuracy in the determination of reported data;

(c) data resulting from the previously applied monitoring methodology has been found incorrect;

(d) the monitoring methodology plan is not, or no longer, in conformity with the requirements of this Regulation;

(e) it is necessary to implement recommendations for improvement of the monitoring methodology plan contained in a verification report.

3. The operator shall notify any intended modification of the monitoring methodology plan to the competent authority without undue delay. However, a Member State may allow the operator to notify, by 31 December of the same year or by another date set by the Member State, intended modifications of the monitoring methodology plan that are not significant within the meaning of paragraph 5.