ANNEX II

LIMIT VALUES FOR NITROGEN DIOXIDE (NO2) AND OXIDES OF NITROGEN (NOx) AND THE ALERT THRESHOLD FOR NITROGEN DIOXIDE Limit values for nitrogen dioxide and oxides of nitrogen Limit values must be expressed in μg/m3. The volume must be standardised at a temperature of 293 °K and a pressure of 101,3 kPa. >TABLE> Alert threshold for nitrogen dioxide 400 μg/m3 measured over three consecutive hours at locations representative of air quality over at least 100 km 2 or an entire zone or agglomeration, whichever is the smaller. Minimum details to be made available to the public when the alert threshold for nitrogen dioxide is exceedeed Details to be made available to the public should include at least: the date, hour and place of the occurrence and the reasons for the occurrence, where known; any forecasts of: changes in concentrations (improvement, stabilisation, or deterioration), together with the reasons for those changes, the geographical area concerned, the duration of the occurrence; the type of population potentially sensitive to the occurrence; the precautions to be taken by the sensitive population concerned.

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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.