Sulfur (S) and nitrogen (N) compounds are essential nutrients for life. In excess, however, S and N can be toxic, even life threatening, and in national parks excess N and S can upset the delicate balances in natural ecosystems. N and S species can cause rain and snowfall to be acidic, and particulate sulfate (SO42-) and nitrate (NO3-) can cause significant visibility impairment and adversely affect human health.

This report describes research funded in collaboration with NOAA's cooperative agreement and the CIRA Joint Institute contract period July 1, 2001 through June 30, 2010. The report is meant to be an overview of the reporting period 2001/02 through 2009/10.

Discusses air pollution: what it is; how it hurts poeple, animals, and plants; and what can be done to protect the air.

Maverick environmental writers William J. Kelly and Chip Jacobs follow up their acclaimed Smogtown with a provocative examination of China's ecological calamity already imperling a warming planet. Toxic smog most people figured was obsolete needlessly kills as many there as the 9/11 attacks every day, while sometimes Grand Canyon-sized drifts of industrial particles aloft on the winds rain down ozone and waterway-poisoning mercury in America. In vivid,...

Discusses the problem of acid rain, its causes, how it spreads, and its devastating effects on the environment. Also examines possible solutions to the problem.