1. The operator or aircraft operator shall notify any proposals for modification of the monitoring plan to the competent authority without undue delay.

However, the competent authority may allow the operator or aircraft operator to notify, by 31 December of the same year, modifications of the monitoring plan that are not significant within the meaning of paragraph 3.

2. Any significant modification of the monitoring plan within the meaning of paragraphs 3 and 4 shall be subject to approval by the competent authority.

Where the competent authority considers a modification not significant, it shall inform the operator or aircraft operator thereof without undue delay.

3. Significant modifications to the monitoring plan of an installation shall include the following:

(a) changes of the category of the installation;

(b) notwithstanding Article 47(8), changes regarding whether the installation is considered an installation with low emissions;

(c) changes to emission sources;

(d) a change from calculation-based to measurement-based methodologies, or vice versa, used to determine emissions;

(e) a change in the tier level applied;

(f) the introduction of new source streams;