What is the percentage of acid in acid rain?

Answer 1

Acid Rain is extremely uncommon. This only happens when there is a volcano near a factory. Usually, factories are far away from when volcanoes are likely to erupt. Then the smoke from the volcano and the factory interacts each other, they form acid cloud. Acid cloud cause acid rain to fall. Acid Rain is common in Venus even though there is no factory because there are a lot of volcanoes on Venus and Venus's atmosphere is full of carbon dioxide. To prevent acid rain, do not build factories nearby a mountain that the volcano is likely to erupt or the volcano have erupted before. The chance of an acid rain is extremely unlikely and extremely tiny amount of chance which is less than a per thousand and it's even smaller and smaller and it's almost impossible but it's still possible, just super unlikely that it looks like it's impossible. Acid Rain is harmful because it kills some animals and plants.

Answer 2

pH of normal rain water is 5.6 while pH of Acid rain water is less than 5. It is due to oxides of nitrogen and sulphur.