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Earth System Atlas (

US Environmental Protection Agency ( The mission of the Environmental Protection Agency is to protect human health and the environment. Since 1970, EPA has been working for a cleaner, healthier environment for the American people.

US Geological Survey Acid Rain Site: National Atmospheric Deposition Program ( The purpose of the network is to collect data on the chemistry of precipitation for monitoring of geographical and temporal long-term trends.


Revised on: 2 February, 2005