Recital 34

(34) Contributions from natural sources can be assessed but cannot be controlled. Therefore, where natural contributions to pollutants in ambient air can be determined with sufficient certainty, and where exceedances are due in whole or in part to these natural contributions, these should be able to, under the conditions laid down in this Directive, be subtracted when assessing compliance with air quality limit values and average exposure reduction obligations. Contributions to exceedances of particulate matter (PM10) limit values attributable to winter-sanding or winter-salting of roads should also be able to be subtracted when assessing compliance with air quality limit values provided that reasonable measures have been taken to lower concentrations. Subtractions of those contributions do not prevent Member States from taking action to reduce their health impact.

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Source: EUR-Lex (Cellar) · retrieved 2026-10-16 · Text as adopted (Official Journal); later amendments are not incorporated in this text.