The EPA on Tuesday today granted a petition for reconsideration of a Bush Administration memo regarding the scope of the Clean Air Act. The interpretive memo, put forward by then-EPA Administrator Stephen Johnson in December 2008, addresses when the Prevention of Significant Deterioration program applies to CO₂.

Concerns were soon raised about the memo's potential impact on American communities and neighborhoods. The Sierra Club and other parties in early January petitioned EPA to reconsider the Johnson memorandum.

"I am granting this petition because we must learn more about how this memo affects all relevant stakeholders impacted by its provisions," said EPA Administrator Lisa P. Jackson "This will be a fair, impartial and open process that will allow the American public and key stakeholders to review this memorandum and to comment on its potential effects on communities across the country. EPA's fundamental mission is to protect human health and the environment and we intend to do just that."

In a press release, the EPA said it will vigorously review the Johnson memo to ensure that it is consistent with the Obama Administration's climate change strategy and interpretation of the Clean Air Act.

The agency is seeking comment from the general public on this memo and its potential impact on American communities. This public comment period is consistent with the recommendations of the Environmental Appeals Board, which last year held that the EPA had not adequately articulated why its interpretation of the PSD program did not apply to CO₂.