Ill. Admin. Code tit. 35, § 240.152
a) Exhaust emissions from light duty vehicles shall not exceed the following limitations:
| Model Year | Carbon Monoxide | Hydrocarbons as Hexane |
| (%) | (ppm) | |
| 1996 and newer | 1.2 | 220 |
b) Exhaust emissions from light duty trucks 1 and light duty trucks 2 shall not exceed the following limitations:
| Model Year | Carbon Monoxide | Hydrocarbons as Hexane |
| (%) | (ppm) | |
| 1996 and newer | 1.2 | 220 |
c) Exhaust emissions from heavy duty vehicles shall not exceed the following limitations:
| Model Year | Carbon Monoxide | Hydrocarbons as Hexane |
| (%) | (ppm) | |
| 1996 and newer | 3.0 | 300 |
(Source: Amended at 35 Ill. Reg. 5552, effective March 18, 2011)