AI Summary

The lawsuit filed by cities against the EPA highlights a discrepancy between the agency's regulatory standards and its enforcement actions. The EPA has been accused of failing to uphold a soot standard, which is a key component of the National Ambient Air Quality Standards (NAAQS). This standard is intended to protect public health by limiting exposure to particulate matter. The cities' lawsuit suggests that the EPA's inaction on this issue may be a breach of its duties under the Clean Air Act.

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