Deutsches Institut fur Normung e. V.

Ambient air - Standard method for the measurement of the concentration of ozone by ultraviolet photometry
 N EN 14625

Annotation

This European Standard specifies a continuous measurement method for the determination of the concentrations of ozone present in ambient air based on the ultraviolet photometric measuring principle. This standard describes the performance characteristics and sets the relevant minimum criteria required to select an appropriate ultraviolet photometric analyser by means of type approval tests. It also includes the evaluation of the suitability of an analyser for use in a specific fixed site so as to meet the data quality requirements as specified in Annex I of Directive 2008/50/EC [1] and requirements during sampling, calibration and quality assurance for use.

The method is applicable to the determination of the concentration of ozone present in ambient air up to 500 g/m3. This concentration range represents the certification range for ozone for the type approval test.

NOTE 1 Other ranges may be used for measurement systems applied at rural locations monitoring ecosystems.

NOTE 2 When the standard is used for other purposes than Directive 2008/50/EC, the ranges and uncertainty requirements may not apply.

The method covers the determination of ambient air concentrations of ozone in zones classified as rural areas, urban and urban-background areas.

The results are expressed in g/m3 (at 20 °C and 101,3 kPa).

NOTE 3 500 g/m3 of O3 corresponds to 250 nmol/mol of O3 at 20 °C and 101,3 kPa.

This standard contains information for different groups of users.