Was acid rain real?

Yes, Acid Rain Was Real

Acid rain was first detected in North America at Hubbard Brook during the mid-1960s. Subsequent research revealed that it was caused by the long-range transport of sulfur dioxide and nitrogen oxides emitted from power plants. The findings from Hubbard Brook played a significant role in shaping both national and international policies regarding acid rain, including the amendments made to the Clean Air Act in 1990.