- NTH Consultants, Ltd.
- Farmington Hills
Specializes in infrastructure engineering, environmental management and evaluation of construction materials including roofing, steel, concrete and pavement.
www.nthconsultants.com
- Pinnacle Consulting Group, Inc.
- Rochester Hills
Consulting on compliance and pollution issues, and providing software development.
www.pinnaclecorp.com
- Air Analysis and Consulting Company
- Saint Clair Shores
www.airtest.com
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