Ill. Admin. Code tit. 83, § 530.15
The gas, before and after burning, shall not contain the following compounds in excess of listed concentrations in parts per million.
| Compound | Concentration |
| Pentane | 600 |
| Hexane | 50 |
| Benzene | 10 |
| Iso-octane | 300 |
| Methylbenzene | 100 |
| Ethylbenzene | 100 |
| m,p-xylene | 100 |
| o-xylene | 100 |
| Nonane | 200 |
| Isopropylbenzene | 50 |
| Naphthalene | 10 |