Wikipedia: Acid Rain
Article on the air-pollution phenomenon acid rain. Features the details of chemical emission leading to this effect, lists the adverse effects, and suggests preventive measures.
Swedish NGO Secretariat on Acid Rain
Joint venture between five Swedish environmental organizations with the chief purpose of promoting awareness of the problems associated with air pollution.
USGS: What Is Acid Rain?
Commonly used to mean the deposition of acidic components in rain, snow, fog, dew, or dry particles.
Acid Deposition and Precipitation
Formation, deposition information for Canada and British Columbia, suggested solutions, and links to other Canadian and U.S. resources.
What Is Acid Rain and What Causes It?
Overview from the Almanac of Policy Issues about the broad term used to describe the way that acids fall out of the atmosphere.