| Abbreviation | Definition |
|---|---|
| CEHT | Certified Environmental Health Technician |
| CEI | Chalmers Environmental Initiative |
| CEI | civil environmental and industrial |
| CEI | Comprehensive Environmental Inc |
| CEIC | California Environmental Information Clearinghouse |
| CEIC | Chesapeake Environmental Improvement Council |
| CEICI | certified Environmental Infection Control Investigator |
| CEIG | community environmental improvement grant |
| CEIN | Center for Environmental Implications of Nanotechnology |
| CEIP | Commonwealth Environmental Investment Platform |
| CEJ | Center for Environmental Journalism |
| CEJA | California Environmental Justice Alliance |
| CEL | Ceiling Exposure Limit |
| CEL | Commission on Environmental Law |
| CELB | Center for Environmental Leadership in Business |
| CELP | Catalina Environmental Leadership Program |
| CELP | Center for Environmental Law and Policy |
| CELRA | Centre for Environmental Law Research and Action |
| CELS | Center for Environmental and Life Sciences |
| CELT | Centre for Environmental Living and Training |