Question juridique clé
Whether the municipality was entitled to appeal the plan approval decision and to invoke federal administrative law remedies.
Solution extraite
The municipality was entitled to appeal insofar as its own public tasks and protected interests were affected; it could not complain on behalf of another municipality.
Motifs extraits
A public entity may have standing when the decision affects its official competences and public interests, including protection of inhabitants from emissions. The appeal was therefore admissible only within those limits.