"BILLINGS, Mont. — U.S. environmental regulators on Tuesday announced they are leaving intact an air quality standard for power plant pollution that can worsen asthma in children, despite calls by health advocates for a tougher rule.
The move keeps in place a threshold for sulfur dioxide pollution established in 2010 by the U.S. Environmental Protection Agency under President Barack Obama. Sulfur dioxide comes from burning coal to produce electricity and from other industrial sources.
Advocacy groups including the American Lung Association had urged EPA to lower the amount of the pollution it allows, from 75 parts per billion of sulfur dioxide in ambient air to 50 parts per billion."