...each air pollutant — "(A) which in his judgment has an adverse effect on public health and welfare; "(B) the presence of which in the ambient air results...from numerous or diverse mobile or stationary sources ; and "(C) for which air quality criteria had not been issued before the date of enactment of the Clean...

...each air pollutant — (A) which in his judgment has an adverse effect on public health and welfare ; (B) the presence of which in the ambient air results...numerous or diverse mobile or stationary sources; and (C) for which air quality criteria had not been issued before the date of enactment of the Clean...

...each air pollutant — (A) which In his judgment has an adverse affect on public health or welfare; <B) the presence of which in the ambient air results...numerous or diverse mobile or stationary sources; and (C) for which air quality criteria had not been issued before December 31, 1970 but for which he...

...each air pollutant — (A) which in his judgment has an adverse effect on public health or welfare ; (B) the presence of which in the ambient air results...numerous or diverse mobile or stationary sources; and (C) for which air quality criteria had not been issued before the date of enactment of the Clean...

...contribute to air pollution which may reasonably be anticipated to endanger public health or welfare; (B) the presence of which in the ambient air results...numerous or diverse mobile or stationary sources; and (C) for which air quality criteria had not been issued before December 31, 1970, but for which...

...contribute to air pollution which may reasonably be anticipated to endanger public health or welfare ; (B) the presence of which in the ambient air results...numerous or diverse mobile or stationary sources; and (C) for which air quality criteria had not been issued before the date of enactment of the Clean...

...standard for any pollutant which may reasonably be anticipated to endanger public health or welfare, the presence of which In the ambient air results from...numerous or diverse mobile or stationary sources. EPA is presently reviewing its ability to set an ambient standard for sulfate. To date EPA has not...

...standard for any pollutant which may reasonably be anticipated to endanger public health or welfare, the presence of which in the ambient air results from...numerous or diverse mobile or stationary sources. EPA is presently reviewing its ability to set an ambient standard for sulfate. To date EPA has not...

...contribute to air pollution which may reasonably be anticipated to endanger public health or welfare ; (B) the presence of which in the ambient air results...numerous or diverse mobile or stationary sources; and (C) for which air quality criteria had not been issued before the date of enactment of the Clean...

...contribute to air pollution which may reasonably be anticipated to endanger public health or welfare; (B) the presence of which in the ambient air results...numerous or diverse mobile or stationary sources; and (C) for which air quality criteria had not been issued before the date of enactment of the Clean...