# RegPermit corpus search: "PSD applicability major source thresholds"

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**How to use this service** (RegPermit air-quality regulatory corpus):
- Read the full text of any result: fetch its **Full text** link above.
- Search again: fetch `https://data.regpermit.com/search/<your+query>` — or just `https://data.regpermit.com/<your query>`.
- Look up an exact citation: `https://data.regpermit.com/cite/40 CFR 52.21`.
- Filter by jurisdiction: add `?j=tx,nm` (federal, tx, nm, ut, co, va, nm-bernco, nm-cabq).
- Machine-readable: add `?format=json`. Full API: `https://data.regpermit.com/llms.txt`.

Results include both binding rules and agency guidance — for the controlling requirement, prefer a result whose citation is a CFR section or a state administrative code. Cite the **Source** link on each chunk page; a long passage links its continuation (Continues in →).