1. Acid rain is when the pH of the rain is too high and the rain is acidic. Sulfur dioxide and nitrogen oxides are the most common chemicals in acid rain. Acid rain is usually caused by pollution.
2. Acid rain affects humans because nobody likes rain that could burn your skin and they dissolve buildings made of limestone. Lung diseases like asthma and bronchitis are usually caused.
3. Acid rain poisons the soil and can damage trees really badly.
4. Most all the life in the systems die.
5. I do not know where you live, but big cities often do have acid rain