...Air Act, necessarily subjects to control in the interest of our national health and welfare. bered that the law provides for the achievement of the primary...standards that protect against damage to materials and vegetation. In a number of instances States have imposed regulations to achieve the secondary standards...

...these plans have evinced two characteristics of extreme importance with regard to coal. First, талу have chosen 1975 as a "reasonable time" to meet the...stringent secondary standards in addition to the primary standard. I recall the date for achieving the primary standards is set in the statute at 1975, while...

...these plans have evinced two characteristics of extreme importance with regard to coal. First, many have chosen 1975 as a "reasonable time" to meet the...stringent secondary standards in addition to the primary standard. I recall the date for achieving the primary standards is set in the statute at 1975. while...