anx_V__para__6

The maximum uncertainty of modelling applications is set to the uncertainty for fixed measurements multiplied by the applicable maximum ratio. The modelling quality objective (i.e. a modelling quality indicator less or equal to 1) shall be verified at least at 90 % of the available sampling points, over the assessment area and period considered. At a given sampling point, the modelling quality indicator shall be calculated as the ratio of the root mean square error(s) between modelling results and measurements over the square root of the quadratic sum(s) of the modelling application and measurement uncertainties, over an entire assessment period. Note that the sum will reduce to a single value when annual means are considered. All fixed measurements that meet the data quality objectives (i.e. uncertainty of measurement and data coverage of measurement as specified in this Point and Point B, respectively) located in the modelling application assessment area shall be used for the evaluation of uncertainty of the modelling application. Note that the maximum ratio shall be interpreted as being applicable over the entire concentration range.

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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.