1.For those pollutants listed in Annex I, the Commission shall submit to the Council proposals for the setting of limit values and, as appropriate, alert thresholds according to the following timetable:
no later than 31 December 1996 for pollutants 1 to 5,
in accordance with Article 8 of Directive 92/72/EEC for ozone,
no later than 31 December 1997 for pollutants 7 and 8,
as soon as possible, and no later than 31 December 1999, for pollutants 9 to 13.
In fixing the limit values and, as appropriate, alert thresholds, account shall be taken, by way of example, of the factors laid down in Annex II.
Regarding ozone, these proposals will take account of the specific formation mechanisms of this pollutant and, to this end, provision may be made for target values and/or limit values.
If a target value fixed for ozone is exceeded, Member States shall inform the Commission of the measures taken in order to attain that value. On the basis of this information the Commission shall evaluate whether additional measures are necessary at Community level and, should the need arise, shall submit proposals to the Council.
For other pollutants, the Commission shall submit to the Council proposals for fixing limit values and, as appropriate, alert thresholds if, on the basis of scientific progress and taking into account the criteria laid down in Annex III, it appears necessary to avoid, prevent or reduce the harmful effects of such pollutants on human health and/or the environment as a whole within the Community.
2.The Commission shall be responsible, taking account of the most recent scientific-research data in the epidemiological and environmental fields concerned and of the most recent advances in metrology, for re-examining the elements on which the limit values and alert thresholds referred to in paragraph 1 are based.
3.When limit values and alert thresholds are set, criteria and techniques shall be established for:
(a)the measurement to be used in implementing the legislation referred to in paragraph 1:
(a)the location of the sampling points,
the minimum number of sampling points,
the reference measurement and sampling techniques;
(b)the use of other techniques for assessing ambient air quality, particularly modelling:
(b)spatial resolution for modelling and objective assessment methods,
reference modelling techniques.
These criteria and techniques shall be established in respect of each pollutant according to the size of agglomerations or to the levels of pollutants in the zones examined.
4.To take into account the actual levels of a given pollutant when setting limit values and the time needed to implement measures for improving the ambient air quality, the Council may also set a temporary margin of tolerance for the limit value.
This margin shall be reduced according to procedures to be defined for each pollutant in order to attain the level of the limit value at the latest at the end of a period to be determined for each pollutant when that value is set.
5.In accordance with the Treaty, the Council shall adopt the legislation provided for in paragraph 1 and the provisions laid down in paragraphs 3 and 4.
6.When a Member State takes more stringent measures than those laid down in the provisions referred to in paragraph 5, it shall inform the Commission thereof.
7.When a Member State intends to set limit values or alert thresholds for pollutants not referred to in Annex I and not covered by Community provisions concerning ambient air quality in the Community, it shall inform the Commission thereof in sufficient time. The Commission shall be required to supply, in sufficient time, an answer to the question of the need to act at Community level following the criteria laid down in Annex III.