<prompt> Translate the following text to EnglishKatika uchambuzi wa Smith-Vonovitch-Brownback, ambapo tulichunguza viwango vya kupunguza SO2 na NOx sawa na S556, viwango vya kupunguza zebaki ni kidogo kuliko S556 na hakuna upungufu wa CO2, hatukuona athari kubwa kwa uzalishaji wa makaa ya mawe au bei ya umeme.  <response>: In the SmithVoinovichBrownback analysis, when we analyzed SO2 and NOx reduction levels similar to S. 556, mercury reduction levels more modest than S. 556 and no CO2 reductions, we did not find significant impacts on coal production or electricity prices. 