Acid rain, a form of pollution caused by the combination of nitrogen dioxide, sulfur, and atmospheric moisture, can occur as rain, snow, hail, or fog. Scientists agree that acid rain damages the environment, but they disagree as to the severity of the problem.
Acid rain—Environmental aspects
Acid rain—Environmental aspects—United States
Acid rain—Laws and regulations
CQ Researcher, March 3, 1991.
Editorials on File. Facts on File.
Facts on File
McGraw-Hill Encyclopedia of Science and Technology, 1992.
The New Book of Popular Science. Grolier, 1994.
EBSCO Magazine Article Summaries
NewsBank and other newspaper indexes
Readers’ Guide to Periodical Literature
SIRS (Social Issues Resources Series)