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Environmental Protection Agency Administrator Michael Regan speaks at the University of Maryland, May 11, 2023, in College Park, Md. The EPA is delaying plans to tighten air quality standards for ground-level ozone — better known as smog — despite a recommendation by a scientific advisory panel to lower air pollution limits to protect public health. (AP Photo/Nathan Howard, File)

Environmental Protection Agency Administrator Michael Regan speaks at the University of Maryland, May 11, 2023, in College Park, Md. The EPA is delaying plans to tighten air quality standards for ground-level ozone — better known as smog — despite a recommendation by a scientific advisory panel to lower air pollution limits to protect public health. (AP Photo/Nathan Howard, File)

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