2. At the present time, is there a rule promulgated under either section 111 or 112 of the Clean Air Act that controls mercury emissions? Answer Yes or No, and provide a 1 to 2 sentence explanation.

3. Section 112 of the Clean Air Act treats mercury emissions from coal-fired power plants differently than mercury emissions from incinerators and chlor-alkali plants. Explain these differences. And then explain why these differences help explain why there is no control of mercury under Section 112 even now, some 18 year after the 1990 Clean Air Act amendments. (two paragraph answer)