Recorded prices, banked inventory by district, and a direct line to the holders — in one place.
SOx demand is thinner than NOx or ROG, and SOx volumes often trade as add-ons to a larger deal — but recorded 2022 sales ran as high as $20,000/ton in the Bay Area.
| District | Median $/ton | Low | High |
|---|---|---|---|
| Yolo-Solano AQMD | $17,000 | $17,000 | $17,000 |
Source: CARB 2023 ERC transaction report; 2022 and South Coast 2024 tables on the prices page. Yolo-Solano's own transaction history (1998–2024) shows SOx clearing $500–$17,000/ton across 30 recorded transactions.
Registry entries confirming banked SOx volumes, by district:
Search all banked SOx ERCs Post what you need — we find it
ERCs are district-bound: a SOx credit is usable in the district (or, with approval, the air basin) where it was generated. Tell us the district and tonnage your permit requires and we search the registries, contact holders, and can represent you as buyer's broker — no fee to inquire. Holders list free and set their own price.