The headline needs to preserve key facts: EPA, PM2.5 NAAQS, D.C. Circuit, the rule survived/upheld. Need to make it concise and punchy.

Short summary

The D.C. Circuit upheld EPA's 2024 rule lowering the PM2.5 NAAQS from 12.0 to 9.0 µg/m³, keeping the stricter standard in effect. This reduces permitting headroom for new and expanding facilities, potentially requiring additional modeling, emissions controls, and longer timelines. Texas counties including Dallas, Harris, and Tarrant are at risk of nonattainment designations, which would trigger stricter new source review requirements.

• •D.C. Circuit upheld EPA's lowered PM2.5 standard of 9.0 µg/m³
• •Reduced permitting headroom affects manufacturers, data centers, logistics, and infrastructure projects
• •Texas counties like Dallas, Harris, and Tarrant face potential nonattainment designations

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