http://www.legislation.gov.uk/id/eudr/2008/50/annex/VI/division/B

ANNEX VIReference methods for assessment of concentrations of sulphur dioxide, nitrogen dioxide and oxides of nitrogen, particulate matter (PM₁₀ and PM_2,5), lead, benzene, carbon monoxide, and ozone

B.Demonstration of equivalence

4.

Member States should ensure that whenever appropriate, the correction is also applied retroactively to past measurement data in order to achieve better data comparability.

ANNEX VIReference methods for assessment of concentrations of sulphur dioxide, nitrogen dioxide and oxides of nitrogen, particulate matter (PM10 and PM2,5), lead, benzene, carbon monoxide, and ozone

B.Demonstration of equivalence

4.

ANNEX VIReference methods for assessment of concentrations of sulphur dioxide, nitrogen dioxide and oxides of nitrogen, particulate matter (PM₁₀ and PM_2,5), lead, benzene, carbon monoxide, and ozone