“Control of the emission of nitrogen dioxide has been the subject of Community legislation for many years. The first Framework Directive of the Council is 96/62/EC of27 September 1996 . Under Article 4 the Commission was obliged to submit proposals to the Council for the setting of limit values. Under Article 8(1) Member States were required to draw up a list of zones and agglomerations in which the levels of one or more pollutants were higher than the limit value plus the margin of tolerance. Article 8(3) required Member States to take measures in respect of those zones to ensure that a plan or programme was prepared or implemented for attaining the limit value within the specified time limit.”
“Where, in a given zone or agglomeration, conformity with the limit values for nitrogen dioxide...cannot be achieved by the deadlines specified in Annex XI, a Member State may postpone those deadlines by a maximum of five years for that particular zone or agglomeration, on condition that an air quality plan is established in accordance with Article 23 for the zone or agglomeration to which the postponement would apply; such air quality plan shall be supplemented by the information listed in Section B of Annex XV related to the pollutants concerned and shall demonstrate how conformity will be achieved with the limit values before the new deadline.”
“Where, in a given zone or agglomeration, conformity with the limit values for PM10 as specified in Annex XI cannot be achieved because of site-specific dispersion characteristics, adverse climatic conditions or transboundary contributions, a Member State shall be exempt from the obligation to apply those limit values until11 June 2011 provided that the conditions laid down in paragraph 1 are fulfilled and that the Member State shows that all appropriate measures have been taken at national, regional and local level to meet the deadlines.”
“Where, in given zones or agglomerations, the levels of pollutants in ambient air exceed any limit value..., plus any relevant margin of tolerance in each case, Member States shall ensure that air quality plans are established for those zones and agglomerations in order to achieve the related limit value or target value specified in [Annex] XI... In the event of exceedances of those limit values for which the attainment deadline is already expired, the air quality plans shall set out appropriate measures, so that the exceedance period can be kept as short as possible.”
"However, in accordance with Article 22 [the air quality plan] will aim to demonstrate compliance by 2015... Second, the obligation to comply with air quality limits gives rise to an obligation to prepare an air quality plan for that zone which brings about compliance in the shortest possible time, but in the case of NO 2 by 2015 at the latest. The Secretary of State is already working on a plan in accordance with this obligation and plans for Greater London and any other relevant zones will be published and consulted upon as soon as possible in the new year and in any event by around May at the latest with a view to submitting these to the Commission in September."
"...the UK will be submitting plans with a view to postponement of the compliance date of 2015 where attainment by this date is projected. Plans for zones where full compliance is currently expected after that date will also be submitted to the Commission under Article 23 on the basis that they set out actions to keep the exceedances period as short as possible."
“12. ... Article 22(1) gives to Member States a discretion to apply to postpone the deadline by a maximum of five years. The use of the word ‘may’ in the English test and ‘peut’ in the French text is unequivocal. It confers a discretion. If a State would otherwise be in breach of its obligations under Article 13 and wishes to postpone the time for compliance with that obligation, then the machinery provided by Article 22(1) is available to it, but it is not obliged to use that machinery. It can, as the United Kingdom Government has done, simply admit its breach and leave it to the Commission to take whatever action the Commission thinks right by way of enforcement under Article 258 of the Treaty on the Functioning of the European Union.”
“16. ... It is not necessary for me to declare that that is so. This judgment records the Secretary of State's concession and my view about the correctness of that concession. A declaration will serve no purpose other than to make clear that which is already conceded.”