PART IINITROGEN DIOXIDE (NO2) AND OXIDES OF NITROGEN (NOx)
Limit values for nitrogen dioxide and oxides of nitrogen
2.1
| Averaging period | Limit value | Margin of tolerance | Date by which limit value is to be met | |
|---|---|---|---|---|
1. Hourly limit value for the protection of human health | 1 hour | 200 μg/m3 NO2, not to be exceeded more than 18 times a calendar year | 70 μg/m3 on 1st January 2003, reducing on 1st January of each following year by equal annual amounts to reach 0 μg/m3 by 1st January 2010 | 1st January 2010 |
2. Annual limit value for the protection of human health | Calendar year | 40 μg/m3 NO2 | 14 μg/m3 on 1st January 2003, reducing on 1st January of each following year by equal annual amounts to reach 0 μg/m3 by 1st January 2010 | 1st January 2010 |
3. Annual limit value for the protection of vegetation | Calendar year | 30 μg/m3 NOx | None |
Alert threshold for nitrogen dioxide
2.2 400 μg/m3 measured over three consecutive hours at locations representative of air quality over at least 100 km2 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 exceeded
2.3 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 concentration (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.