Back in 2007, U.S. EPA was sued by some States and environmental groups who challenged the legitimacy of the ozone standard -75 parts per billion (ppb)- selected by the Bush Administration. In 2009, the Obama Administration announced that it was reconsidering the 75 ppb standard.
U.S. EPA is likely to revise the standard to somewhere between 60 ppb
U.S. EPA released is long awaited replacement rule for the Clean Air Interstate Rule (CAIR) which was the controversial cap and trade program for coal-fired utilities.
The Obama Administration announced it would review the revised ozone standard of .75 ppb that was previously established by the Bush Administration. The Obama Administration has said if they decide to revise the ozone standard below .75 ppb they will announce it by December of 2009 and finalize the standard by August 2010.