Contact Us to ask a question, provide feedback, or report a problem.
Last updated on December 4, 2024
An official website of the United States government
Here’s how you know
Official websites use .gov
A .gov website belongs to an official government organization in the United States.
Secure .gov websites use HTTPS
A lock () or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.
Learn the basics of acid rain on What is Acid Rain and Effects of Acid Rain.
Learn about the Acid Rain Program and Acid Rain Program Results.