The Environmental Protection Agency (EPA) issued a final rule that partially approves and partially disapproves Arizona's State Implementation Plan (SIP) for addressing regional haze, a form of air pollution. Arizona's plan aimed to tackle haze by revising strategies to improve visibility in protected natural areas. The EPA found that while some parts of the plan meet federal requirements, others do not because they lack adequate analysis or justification. The EPA's decision starts a process that could lead to federal intervention unless Arizona submits an improved plan that meets all necessary criteria.
Simple Explanation
The EPA said that Arizona's plan to clean up the air isn't good enough because it doesn't have everything needed to make a big park view clear again; so they told Arizona to try again and improve it.