Recorded prices, banked inventory by district, and a direct line to the holders — in one place.
NOx is the most demanded offset pollutant in California — it drives ozone formation, and New Source Review permits in ozone nonattainment areas (San Joaquin Valley and South Coast are classified Extreme; Sacramento Metro is Serious) carry binding NOx offset requirements at ratios up to 1.5-to-1.
| District | Median $/ton | Low | High |
|---|---|---|---|
| Imperial County APCD | $2,500 | $2,000 | $3,098.35 |
| Yolo-Solano AQMD | $37,800 | $37,800 | $37,800 |
| Feather River AQMD | $30,000 | $30,000 | $30,000 |
| South Coast AQMD | $400,000 | $380,000 | $420,000 |
| Bay Area AQMD | $29,000 | $23,235.72 | $29,090 |
| San Joaquin Valley APCD | $13,750 | $9,500 | $18,000 |
| Santa Barbara County APCD | $125,000 | $125,000 | $125,000 |
| Ventura County APCD | $65,000 | $65,000 | $65,000 |
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 NOx clearing $990–$75,000/ton across 36 recorded transactions.
Registry entries confirming banked NOx volumes, by district:
Search all banked NOx ERCs Post what you need — we find it
ERCs are district-bound: a NOx 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.