Smog Levels

Smog levels in the U.S. are higher than what scientists consider safe for public health. In order to change it and enforce lower emissions, rules and regulations need to be updated. Today, president Obama refused to update 2008 rules and regulations on this issue and postponed this decision till 2013, or after election as the author of this article points out. Read the article to see what the recommended levels by scientists are, and what the enforced and regulated levels were during the Bush and Obama administrations, as well as a general cost-benefit comparison of these different levels.

Reference:
http://blogs.scientificamerican.com/observations/2011/09/02/smog-levels-to-remain-higher-than-scientists-suggest-safe-for-public-health/