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air quality standard
environ., industr.	Qualitätsnorm für die Luft
nat.res.	Luftbeschaffenheitsnorm f
air quality standards
environ.	Qualitätsnormen der Luft
transp., mech.eng., el.	Luftgütenormen f; Luftreinheitsnormen f

air quality standard: 8 phrases in 4 subjects

Environment	2
General	1
Nuclear physics	4
Politics	1