The Environmental Protection Agency is reaffirming a program allowing electric power plants to trade emissions, based on its finding that this is more effective at reducing regional haze than requiring them to install technology to filter their emissions. States whose emissions from power plants contribute to downwind states' failure to meet National Ambient Air Quality Standards for visibility are required to reduce their emissions. This usually had been accomplished by requiring power plants built between 1962 and 1977 to install the best available retrofit technology to scrub emissions.
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