Under the Acid Rain Program (ARP) as initially outlined in the CAAA of 1990, a cap-and-trade allowance program was established for both SO₂ and NO_X.

Question

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The Acid Rain Program (ARP) established under the Clean Air Act Amendments (CAAA) of 1990 set up a cap-and-trade system specifically for sulfur dioxide (SO2) and not for nitrogen oxides (NOx). The primary focus was on reducing emissions of SO2, a major contributor to acid rain.

Under the Acid Rain Program (ARP) as Initially Outlined in the CAAA