40 CFR Part 63, Table 2
Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
| For vents from these processes . . . | You must meet the following emissions limits . . . a |
|---|---|
| Total hydrocarbon ppm by volume expressed as propane corrected to 4 percent carbon dioxide | Dioxin and furan (dioxins and furans) nanograms/dscmexpressed as TEQ corrected to7 percent O2 |
| Collocated blast and reverberatory furnaces (new and existing) | 20 ppmv | 0.50 ng/dscm. |
| Collocated blast and reverberatory furnaces when the reverberatory furnace is not operating for units that comments construction or reconstruction before June 9, 1994 | 360 ppmv | 170 ng/dscm. |
| Collocated blast and reverberatory furnaces when the reverberatory furnace is not operating for units that commence construction or reconstruction after June 9, 1994 | 70 ppmv | 170 ng/dscm. |
| Blast furnaces that commence construction or reconstruction before June 9, 1994 | 360 ppmv | 170 ng/dscm. |
| Blast furnaces that commence construction or reconstruction after June 9, 1994 | 70 ppmv | 170 ng/dscm. |
| Blast furnaces that commence construction or reconstruction after May 19, 2011 | 70 ppmv | 10 ng/dscm. |
| Reverberatory and electric furnaces that commence construction or reconstruction before May 19, 2011 | 12 ppmv | 0.20 ng/dscm. |
| Reverberatory and electric furnaces that commence construction or reconstruction after May 19, 2011 | 12 ppmv | 0.10 ng/dscm. |
a There are no standards for dioxins and furans during periods of startup and shutdown.