Ministerial Decree No. 261 laying down technical directives for the preliminary assessment of ambient air quality and criteria for the elaboration of the plan and the programmes referred to in articles 8 and 9 of Legislative Decree No. 351 of 4 August 1999

In implementation of Legislative Decree No. 351 of 1999, this Regulation establishes: (a) technical directives to be followed by the Regions when proceeding to the preliminary assessment of ambient air quality and the delimitation of the zones where the limit values are or might be exceeded; (b) criteria for the adoption of plans and programmes aimed at ensuring that the limit values are not exceeded; (c) directives to be taken into account by the Regions for the adoption of the plan on maintenance of ambient air quality.