Newer units, constructed under New Source Performance Standards (NSPS), may have their permit requirements tightened and new elements added.

根据新源业绩标准（NSPS）新建的设施，其许可条件可能会收紧，许可要件可能会增加。

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So the last thing people who trust their government would expect is for the EPA to propose NSPS that redefine the source and require fuel switching.

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In general, NSPS are less stringent than BACT.

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