Based on the Environmental Protection Agency’s (EPA’s) review of the air quality criteria and the national ambient air quality standards (NAAQS) for particulate matter (PM), the Administrator has reached final decisions on the primary and secondary PM NAAQS. With regard to the primary standards meant to protect against fine particle exposures (i.e., annual and 24-hour PM2.5 standards), the primary standard meant to protect against coarse particle exposures (i.e., 24-hour PM10 standard), and the secondary PM2.5 and PM10 standards, the EPA is retaining the current standards, without revision.
The final decision was signed on December 4, 2020.
A link to the pre-publication manuscript: https://www.epa.gov/sites/production/files/2020-12/documents/frl-10018-11_12_4_2020_admin.pdf
We do not yet have a publication date, but will do our best to keep you posted on that. We also invite you to check the Federal Register public inspection site – this link shows what will publish in today’s Federal Register: https://www.federalregister.gov/public-inspection/current