A couple of weeks ago, Dr. Mark J. Perry, a professor of economics and finance at the School of Management at the Flint campus of the University of Michigan, published an article on his Carpe Diem blog about how much the air quality has improved over the last 40 years.
In his posting he mentions that the U.S. population has increased by more than 50%, traffic volume (miles driven) in the U.S. has increased 160%, and real GDP has increased 204%; and yet air quality in the U.S. is better than ever - nitrous dioxide, sulfur dioxide, carbon monoxide and lead have all decreased between 46% and 92% between 1980 and 2008.
In the posting he also published a graph showing air quality trend data from the EPA:
Please click here to read the full article.
Jeff
HikingintheSmokys.com Detailed information on trails in the Smoky Mountains; includes trail descriptions, key features, pictures, video, maps, elevation profiles, news, hiking gear store, and more.
2 comments
This is a very good piece of news...that the pollution levels are better t6hna it was in recent times.There is a need that all of us step up for a change.
Good news that it is better in USA but over the world there is a crisis and the pollution levels are very high.
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