Comment submitted by Steven Singleton

I submit this comment on the proposed rule "Attainment Date Extension for the San Joaquin Valley, California 2012 Annual PM2.5 Fine Particulate Matter Nonattainment Area" (FR Doc. 2026-11735; Docket EPA-R09-OAR-2026-3665; FRL-13380-01-R9). This comment does not take a position on whether the requested extension should be granted. It identifies five points in the record where the basis for the proposed action is not fully disclosed and requests that EPA supply the missing information in the docket for this action: 1. Whether the emission-reduction measures relied on for 2025-2030 are adopted, funded, and enforceable, or include discretionarily funded measures of the kind found inadequately supported in the funding-adequacy holding of Medical Advocates for Healthy Air v. EPA, No. 20-72780 (9th Cir. Apr. 13, 2022) for the prior extension covering this same area. 2. The docket number or expected timeline for EPA's stated future evaluation of the modeled attainment demonstration's substantive adequacy (Section IV.D of the proposed action). 3. A sensitivity or uncertainty range around the 2030 design-value projections in Table 1, given that the projected margin at the highest monitor (Bakersfield-Planz) is approximately 0.02 micrograms per cubic meter — about 0.4 percent of the total modeled 2017-2030 reduction. 4. What environmental-justice or disproportionate-impact screening, if any, informed this action, given the San Joaquin Valley's documented public-health profile. 5. The legal basis, beyond Vigil v. Leavitt, 366 F.3d 1025 (9th Cir. 2004), for the newly adopted interpretation in footnote 31 of the "requirements and commitments" precondition under CAA section 188(e). This submission reflects research and analysis that engages directly with the legal framework and implications of the proposed rule, in order to best assess its potential impact on the public interest. It is not advice or direction to any third party — the diligence here is intended to invite clarity into the public record. Full detail supporting each request is set out in the attached comment.