Where is acid deposition worst? What is a buffer?

Acid rain is responsible for severe environmental destruction across the world and occurs most commonly in the North Eastern United States, Eastern Europe and increasingly in parts of China and India. A buffer is a substance that accepts or donates hydrogen ions; it is used to counteract the effects of an acid.

-In most parts of the world that are downwind from coal-burning facilities and from urban areas with large numbers of cars.

-A buffer is simply a mixture of a weak acid and its conjugate base or a weak base and its conjugate acid. Buffers work by reacting with any added acid or base to control the pH.