Why has acid rain become less of a problem in the US?

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BlackTom AI · Accepted Answer

Question restatement: Why has acid rain become less of a problem in the US?

Option 1: 'We have added buffer components to the rain which have reduced its acidity.' In reality, we do not add buffering chemicals to rain to reduce its acidity; the atmospheric chemistry and pH of precipitation are not controlled by adding buffers to rain itself, so this answer misstates a practical mitigation approach.

Option 2: 'Because SO2 and NOx emissions have been reduced, thus reducing the levels of sulfuric and nitric acid in rain.' This option aligns with the main cause of acid rain: sulfuric and nitric acids formed from sulfur dioxide (SO2) and nitrogen oxides (NOx) emitted from fossil fuel combustion. Regulatory actions and cleaner technologies have lowered these emissions, leading to decreases in acid-forming compounds in rain.

Option 3: 'Because we have scrubbed the acids out of the rain, making it less acidic.' Acid rain is formed in the atmosphere before it falls as precipitation; there is no practical process of scrubbing acids out of rain once formed that would have caused the observed improvement. This statement confuses treatment of emissions with treatment of rain itself.

Option 4: 'Acid rain was a problem?' This option questions the existence or significance of the problem, which contradicts decades of scientific evidence showing acid deposition effects on ecosystems, infrastructure, and soils. It ignores the established history and regulatory response to acid rain concerns.

25S-A&O SCI-2-LEC-1 / 25S-A&O SCI-2-LEC-2 Lesson 9f. Acidification Impacts and Remediation - Quiz

Why has acid rain become less of a problem in the US?

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