Congressional leaders are demanding that U.S. Environmental Protection Agency officials make public the science and datasets used in justifying a major new air quality regulation implemented today.

The new rule covers fine particulate matter under the National Ambient Air Quality Standards established by the Clean Air Act (CAA). President Obama, EPA Administrator Lisa Jackson and other Obama and EPA officials claim the new rule will produce $1.7 trillion, or 85 percent of the $2 trillion in total benefits resulting from the CAA between 1990 and 2020.

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