Even as one of the largest utilities in the world, American Electric Power, signaled stepped-up defiance to proposed limits by the Environmental Protection Agency on hazardous emissions from coal-fired power plants, a new government study shows that half of all boilers attached to tall smokestacks across the country lack scrubbers encouraged by Clear Air Act amendments decades ago.
Using scrubbers on smokestacks is an old idea for reducing emission of sulfur dioxide and nitrogen oxides. A set of amendments to the Clean Air Act in 1977 encouraged use of pollution control equipment over so-called dispersion techniques – building tall smokestacks that would release air pollutants high into the atmosphere to protect local air quality.
But such stacks, often rising 500 feet or higher, also increase the distance pollutants travel and can harm the environment far downwind.
The Government Accountability Office found that 56 percent of boilers attached to stall stacks lacked scrubbers to control sulfur dioxide, while 63 percent lacked controls after burning that would capture nitrogen oxides. Some stacks exceed height limitations, as well.
In other words, despite greater use of pollution controls, the GAO said, at many plants utilities are still spewing pollutants without controls into the skies.
Attempts by the EPA to rein in emissions from coal-fired plants has met with stiff resistance by industry and by many Republicans on Capitol Hill.