The Supreme Court refused on Tuesday to consider reducing the Environmental Protection Agency's authority to set air quality standards, leaving intact a tough new limit on sulfur dioxide emissions in a victory for the Obama administration.
Without comment, the court decided not to hear an appeal by Grupo Mexico SAB's Asarco LLC unit of a lower court ruling that upholds a 2010 EPA rule limiting sulfur dioxide in the air to 75 parts per billion over one hour.
Short-term exposure to sulfur dioxide has been linked to respiratory problems. (www.epa.gov/air/sulfurdioxide/).
On Monday, U.S. President Barack Obama in his inauguration speech made the politically charged issue of climate change a top priority for his second term. He cited a need to protect future generations from man-made pollutants.