The across-the-board target of 20% would be particularly difficult to achieve in Member States which have already made great efforts to improve air quality and are now taking as their baseline air whose quality is relatively good.
Vispārējo mērķi 20 % grūtāk sasniegt tām dalībvalstīm, kuras jau daudz darījušas gaisa kvalitātes uzlabošanai, un kurās ir augsts sākuma līmenis.