Member States shall designate at the appropriate levels the competent authorities and bodies responsible for the following:
assessment of ambient air quality, including ensuring an adequate functioning and maintenance of the monitoring network;
approval of measurement systems (methods, equipment, networks and laboratories);
ensuring the accuracy of measurements and the transfer and sharing of measurement data;
promoting the accuracy of modelling applications;
analysis of assessment methods;
coordination on their territory if Union-wide quality assurance programmes are being organised by the Commission;
cooperation with the other Member States and the Commission, including on transboundary air pollution;
establishment of air quality plans and air quality roadmaps;
establishment of short-term action plans;
provision and maintenance of an air quality index and other relevant public information as specified in Annex X.