A variety of air pollutants are emitted into the atmosphere from human-caused and natural emissions sources throughout the United States and elsewhere. These contaminants impact sensitive natural resources in wilderness, including the national parks. The system of national parks in the United States is among our greatest assets. This book provides a compilation and synthesis of current scientific understanding regarding the causes and effects of these pollutants within national park lands. It describes pollutant emissions, deposition, and exposures; it identifies the critical (tipping point) loads of pollutant deposition at which adverse impacts are manifested.

Whether you live in the Southwest or plan to take a vacation here, you are amazed at the beauty of the parks and monuments in the area. No one takes them for granted. 32 locales await you. And if you're heading to Arizona, be sure to grab that book, too!