The U.S. Supreme Court has temporarily halted the EPA's 'Good Neighbor' plan, which aimed to reduce nitrogen oxide emissions from power plants and industrial facilities in 23 states to limit cross-state air pollution. The decision, passed in a 5-4 vote, blocks the rule's enforcement while legal challenges from states and industry groups continue. Critics argue that this ruling jeopardizes public health by allowing upwind states to continue contributing to downwind smog and ozone problems. This move follows the Court's recent trend of limiting federal regulatory power, as evidenced by overturning the Chevron decision, which had allowed federal agencies more leeway in interpreting laws. The EPA and environmental advocates express disappointment, emphasizing the potential negative impacts on vulnerable populations with respiratory issues. Meanwhile, the Court has also handed down other significant rulings, including blocking a Purdue Pharma settlement and mandating Idaho to allow emergency abortions temporarily.