According to the EPA's Draft Report on the Environment 2003, levels of wet sulfate, a major component of acid rain, have dropped by 20-30% since 1990. This success may be attributed to:

Question

Quizplus · Accepted Answer

The Clean Air Act Amendments of 1990 specifically addressed acid rain and included provisions to reduce sulfur dioxide and nitrogen oxide emissions, which are major contributors to acid rain. This is likely the main reason for the decrease in wet sulfate levels since 1990. The other options may have contributed to overall environmental improvements, but they do not directly address acid rain.