Ill. Admin. Code tit. 35, § 241.103
| Agency | Illinois Environmental Protection Agency |
| ALVW | adjusted loaded vehicle weight |
| CAA | Clean Air Act as amended in 1990 |
| CO | carbon monoxide |
| g/bhp-hr | grams per brakehorsepower-hour |
| g/mi | grams per mile |
| GVWR | gross vehicle weight rating |
| HCHO | formaldehyde |
| HDV | heavy-duty vehicle |
| ILEV | inherently low emission vehicle |
| kg | kilograms |
| lbs | pounds |
| LDT | light-duty truck |
| LDV | light-duty vehicle |
| LEV | low emission vehicle |
| LVW | loaded vehicle weight |
| MY | model year |
| NMOG | non-methane organic gas |
| NMHC | non-methane hydrocarbon |
| NOx | oxides of nitrogen |
| PM | particulate matter |
| THC | total hydrocarbon |
| ULEV | ultra low emission vehicle |
| VIN | vehicle identification number |
| ZEV | zero emission vehicle |