UW News
Lei Geng
April 11, 2014
Greenland ice cores show industrial record of acid rain, success of U.S. Clean Air Act
![person with ice core](https://uw-s3-cdn.s3.us-west-2.amazonaws.com/wp-content/uploads/sites/6/2014/04/04183853/J-Cole-Dai%40Summit-150x150.jpg)
Detailed ice core measurements show smog-related ratios leveling off in 1970, and suggests these deposits are sensitive to the same chemicals that cause acid rain.