Recital 12

(12) Fixed measurements should be mandatory in zones where assessment thresholds are exceeded. Modelling applications and indicative measurements, in addition to information from fixed measurements, enable point data to be interpreted in terms of geographical distribution of concentrations. The use of such supplementary techniques of assessment should also allow for reduction of the required minimum number of sampling points for fixed measurements in zones where limit values or target values are met but the assessment threshold is exceeded. In zones where limit values or target values are exceeded, from 2 years following the adoption of implementing acts on modelling applications and on determining the spatial representativeness of sampling points, modelling applications or indicative measurements should be used in addition to mandatory fixed measurements to assess the ambient air quality. Additional monitoring of background concentrations and deposition of pollutants in ambient air should also be carried out to enable better understanding of pollution levels and dispersion.

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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.