On April 30, 2020, the Federal Register published the Environmental Protection Agency’s (EPA’s) proposed decision on review of the national ambient air quality standards (NAAQS) for particulate matter (PM):
Summary: Based on the EPA’s review of the air quality criteria and the NAAQS for PM, the Administrator has reached proposed 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 proposes to retain the current standards, without revision.
Comments must be received on or before June 29, 2020.
Link to the proposed action: https://www.govinfo.gov/content/pkg/FR-2020-04-30/pdf/2020-08143.pdf