Since 1991 acid deposition in some areas of the United States and Canada have been reduced by as much as 35 percent.

Question

Quizplus · Accepted Answer

This reduction is largely due to regulatory measures and environmental policies implemented in both countries, such as the Clean Air Act Amendments of 1990 in the United States, which targeted emissions of sulfur dioxide (SO2) and nitrogen oxides (NOx), the primary precursors of acid rain.

Since 1991 Acid Deposition in Some Areas of the United