[tag=JJ] [lemma=scientific] [□] □
[tag=JJ] [lemma=scientific] [□=□] □
[tag=JJ] [lemma=scientific] [!□] □
The National Ambient Air Quality Standards ( NAAQS , also referred to as " air quality standards " ) are Federal standards , established through extensive scientific review , that set allowable concentrations and exposure limits for certain pollutants .