Umweltbundesamt2025-07-142013https://epflicht.bibliothek.uni-halle.de/handle/123456789/194551691162795urn:nbn:de:gbv:3:2-1177923009931-63027348enghttp://rightsstatements.org/vocab/InC/1.0/500Air quality ... : preliminary evaluation / German Federal Environment Agency (UBA)Periodical