40 CFR Part 63, Table 2
Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
| Organic HAP | CAS Number | Organic HAP subject to cooling tower monitoring requirements in § 63.1409 (Yes/No) |
|---|---|---|
| Column A | Column B | |
| Acrylamide | 79-06-1 | No | No |
| Aniline | 62-53-3 | Yes | No |
| Biphenyl | 92-52-4 | Yes | Yes |
| Cresol and cresylic acid (mixed) | 1319-77-3 | Yes | No |
| Cresol and cresylic acid (m-) | 108-39-4 | Yes | No |
| Cresol and cresylic acid (o-) | 95-48-7 | Yes | No |
| Cresol and cresylic acid (p-) | 106-44-5 | Yes | No |
| Diethanolamine | 111-42-2 | No | No |
| Dimethylformamide | 68-12-2 | No | No |
| Ethylbenzene | 100-41-4 | Yes | Yes |
| Ethylene glycol | 107-21-1 | No | No |
| Formaldehyde | 50-00-0 | Yes | No |
| Glycol ethers | 0 | No | No |
| Methanol | 67-56-1 | Yes | Yes |
| Methyl ethyl ketone | 78-93-3 | Yes | Yes |
| Methyl isobutyl ketone | 108-10-1 | Yes | Yes |
| Naphthalene | 91-20-3 | Yes | Yes |
| Phenol | 108-95-2 | Yes | No |
| Styrene | 100-42-5 | Yes | Yes |
| Toluene | 108-88-3 | No | Yes |
| Xylenes (NOS) | 1330-20-7 | Yes | Yes |
| Xylene (m-) | 108-38-3 | Yes | Yes |
| Xylene (o-) | 95-47-6 | Yes | Yes |
| Xylene (p-) | 106-42-3 | Yes | Yes |
CAS No. = Chemical Abstract Registry Number.