ozone erosion acid rain nutrient runoff
I gave my students this multiple choice question: Sulfur scrubbers are devices installed in coal-fired power plants. Sulfur scrubbers reduce the emission of sulfur dioxide. What environmental problem are sulfur scrubbers most likely trying to address?

Only one answer is correct among these 4 choices:
- ozone
- erosion
- acid rain
- nutrient runoff

Could you tell me which one is correct?

acid rain