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97/101/EC: Council Decision of 27 January 1997 establishing a reciprocal exchange of information and data from networks and individual stations measuring ambient air pollution within the Member States · European Union

Data, calculated over the calendar year, to be transmitted to the Commission: For pollutants 1 to 35: the arithmetic mean, the median, the percentiles 98 (and 99,9 which may be transmitted on a voluntary basis for pollutants for which the mean is calculated over 1 hour) and the maximum calculated from raw data corresponding to the recommended averaging times indicated in the table above; for pollutant 7 (ozone), the statistical parameters should also be calculated from mean values over 8 hours; For pollutants 2, 36 and 37: the arithmetic mean, calculated from raw data corresponding to the recommended averaging times indicated in the table above. The xth percentile should be calculated from the values actually measured. All the values should be listed in increasing order: 1

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Source: EUR-Lex (Cellar) · retrieved 2026-10-12 · Text as adopted (Official Journal); later amendments are not incorporated in this text.