The Environmental Protection Agency (EPA) issued a correction for a previously published rule regarding air quality standards for particulate matter, particularly focusing on PM2.5 standards. The final rule, originally published in March 2024, had errors in its text about deadlines for state plans and technical descriptions for air quality monitors. The EPA clarified that states must submit implementation plans within three years of the standards' announcement, not their effective date. Additionally, several technical corrections were made, such as updating measurement methods and fixing typographical errors, all of which don't change the rule's substance.
Simple Explanation
The EPA fixed mistakes in its rules about air quality and explained that states need to make plans to help clean the air within three years of the new rules being announced. They also fixed some small errors about how air quality is measured, without changing the main rules.