The once azure skies of Athens have been ruined by atmospheric pollution.由于大气污染，雅典曾经蔚蓝的天空已经面目全非。The act imposes more stringent regulations on atmospheric pollution.该法案对大气污染作出更为严格的规定。It's going to raise a lot of problems with respect to atmospheric pollution.这将引起许多有关大气污染的问题。