6. In the notification referred to in paragraph 1, Member States may, for the relevant year, identify:
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(a)
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zones in which transboundary transport of air pollution from one or more Member States contributes significantly to the exceedances of limit values or target values in those zones;
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(b)
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average exposure territorial units, in which transboundary transport of air pollution from one or more Member States contributes significantly to the exceedances of the level determined by the average exposure reduction obligations in those units.
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A Member State may also provide the Member States concerned and the Commission with the lists of any such zones and average exposure territorial units together with information on concentrations and the evidence demonstrating that air pollution from transboundary sources, including from third countries, on which that Member State has no direct control, contributes significantly to the exceedances. The Commission may consider that information, where relevant, for the purposes of Article 18.