Ill. Admin. Code tit. 35, § 220.120
| Act | Illinois Environmental Protection Act |
| Agency | Illinois Environmental Protection Agency |
| Board | Illinois Pollution Control Board |
| °C | degrees Celsius or centigrade |
| cm | centimeters |
| CAAPP | Clean Air Act Permit Program |
| °F | degrees Fahrenheit |
| hr | hours |
| m | meters |
| m3 | cubic meters |
| Mg | megagrams |
| mmbtu | million British thermal units |
| MSW | municipal solid waste |
| MW | megawatt; 1 million watts |
| NMOC | nonmethane organic compounds |
| NOx | nitrogen oxides |
| ppm | parts per million |
| ppmv | parts per million by volume |
| RCRA | Resource Conservation and Recovery Act |
| SIP | State Implementation Plan |
| USEPA | United States Environmental Protection Agency |
| VOC | volatile organic compounds |
| VOM | volatile organic material |
| yr | years |