After years on the proverbial hunt, the Sierra Club “bagged” a victory, convincing the U.S. Court of Appeals for the District of Columbia to vacate the Startup, Shutdown and Malfunction (SSM) rules that have been used to exempt major sources of hazardous air pollutants (HAPs) from complying with Section 112 Maximum Achievable Control Technology (MACT) requirements during SSM events. The Sierra Club v. Environmental Protection Agency decision overturns 14 years of air pollution control law, potentially obligating major sources of HAPs to comply with MACT requirements and emission limits during all phases of operations, including SSM events.

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Source: Environmental Alert
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