Since the implementation of the Clean Air Act, the concentrations of all major air pollutants have decreased. The statement is true.
The Clean Air Act is a federal law which is related to regulate air pollution.
The responsibility of EPA include to protect and refine the air quality of the world, protects the ozone layer by delivering the essential information related to the mechanism of formation and degradation of ozone layer to people.
The last amendment of clean Air act took place in 1990 which addressed some environmental issues like acid rain, toxic pollutants, ozone layer depletion etc.
Some of the important provisions of the 1990 amendment are the application of natural gases and promotion of clean coal, provision of clean fuel by using organic gases derived from natural organism, creation of conservation of energy program.
The statement is true.
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