...quality standard prescribe under subsection (a) of this section shall specify a level of air quality the attainment and maintenance of which in the judgment of the Administrator, based on such criteria, is requisite to protect the public welfare from any known or anticipated adverse effects associated...

...ambient air quality standard prescribed, under subsection (a) shall specify a level of air quality the attainment and maintenance of which in the judgment of the Administrator, based on such criteria, is requisite to protect the public welfare from any known or anticipated adverse effects associated...

...standards. (b)'(l) National primary ambient air quality standards, prescribed under subsection (a) shall be ambient air quality standards the attainment and maintenance of which in the judgement of the Administrator, based on such criteria and allowing an adequate margin of safety, are...

...adequate margin of safety, are requisite to protect the public health. Section 109(b) (2) provides that: maintenance of which in the judgment of the Administrator, based on such criteria, is requisite to protect the public welfare from any known or anticipated adverse effects associated...

...ambient air quality standard prescribed, under subsection (a) shall specify a level of air quality the attainment and maintenance of which in the judgment of the Administrator, based on such criteria, is requisite to protect the public welfare from any known or anticipated adverse effects associated...

...national primary and national secondary air quality standards. National primary air quality standards are "ambient air quality standards the attainment and...maintenance of which in the judgment of the Administrator * * * are requisite to protect the public health." Section 109(b)(l). A national secondary ambient...

...standards. (b)(l) National primary ambient air quality standards, prescribed under subsection (a), shall be ambient air quality standards the attainment...maintenance of which in the judgment of the Administrator as advised by the National Academy of Sciences, based on such criteria and allowing an adequate margin...

...standards. (b)(l) National primary ambient air quality standards, prescribed under subsection (a), shall be ambient air quality standards the attainment...maintenance of which in the judgment of the Administrator as advised by the National Academy of Sciences, based on such criteria and allowing an adequate margin...

...ambient air quality standard prescribed, under subsection (a) shall specify a level of air quality the attainment and maintenance of which in the judgment of the Administrator, based on such criteria, is requisite to protect the public welfare from any known or anticipated adverse effects associated...

...quality standard prescribed, under subsection (a) shall specify a level of air quality the.attainment and maintenance of which in the judgment of the Administrator, based on such criteria, is requisite to protect the public welfare from any known or anticipated adverse effects associated...