Costly regulation is a downside of the EPA's decision to monitor six greenhouse gases under the Clean Air Act. Hence, option C is correct.
The statute that establishes EPA's duties for safeguarding and enhancing the country's air quality and the stratospheric ozone layer is known as the Clean Air Act. The Clean Air Act Amendments of 1990, the final significant revision to the statute, were passed by Congress in that year.
It consists of four main parts: it established National Ambient Air Quality Standards, which were produced by the Environmental Protection Agency and focused on significant polluting chemicals; EPA was required to establish New Source Performance. The creation of thorough federal and state laws to control emissions from both stationary sources and mobile sources was approved by this legislation.
Thus, option C is correct.
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