Alliance Technical Group (ACP-backed) Acquires Air Quality Services (AQS)

Alliance Technical Group Acquires CK Environmental

June 28, 2022

Environmental Services

Decatur, Alabama-based Alliance Technical Group has acquired CK Environmental, an air emissions testing and environmental consulting firm headquartered in Canton, Massachusetts. The acquisition, which closed on June 28, 2022, adds CK Environmental's stack testing, QA/QC and maintenance capabilities to Alliance's national source-testing and emissions monitoring platform.

Alliance Technical Group Acquires Horizon Air Measurement Services

June 21, 2021

Environmental Services

Alliance Technical Group, the environmental testing and compliance platform backed by Align Capital Partners, has acquired Horizon Air Measurement Services, a Camarillo, California provider of source/stack emission testing. The add-on expands Alliance's West Coast footprint and technical capacity as the company continues platform roll-up growth under ACP.

Alliance Technical Group Acquires Chemtech Consulting and Air Testing Operations from Civil & Environmental Consultants

December 27, 2023

Environmental Services

Alliance Technical Group acquired Chemtech Consulting Group, Inc. (Mountainside, New Jersey) and the air testing operations of Civil & Environmental Consultants, Inc. (locations in St. Louis, Charlotte and Knoxville) to expand its laboratory and air emissions testing capabilities and geographic footprint. The air testing carve‑out was a divestiture by CEC (advised by AEC Advisors); Alliance said the deals broaden its service coverage across key U.S. markets.

Alliance Technical Group Acquires Emission Monitoring Service, Inc. (EMSI)

April 1, 2021

Environmental Services

Alliance Technical Group, a portfolio company of Align Capital Partners, acquired Emission Monitoring Service, Inc. (EMSI) in a transaction that closed April 1, 2021. EMSI, headquartered in Baytown, Texas, provides emissions leak detection, repair and regulatory compliance services and employs more than 300 technicians; the deal provided liquidity to an absentee majority owner and expands Alliance's environmental services footprint and capabilities.

Alliance Technical Group Acquires ESC Spectrum

July 7, 2025

Environmental Services

Alliance Technical Group, a Morgan Stanley Capital Partners–backed environmental services platform, has acquired ESC Spectrum, a provider of Continuous Emissions Monitoring Systems (CEMS) and Data Acquisition Systems (DAS). The deal adds ESC Spectrum's software, hardware, and field-service capabilities to Alliance's nationwide compliance, stack testing, and laboratory services, accelerating Alliance's CEMS/DAS offering and scale.

Alliance Technical Group Acquires Environmental 360

June 20, 2025

Environmental Services

Alliance Technical Group acquired Environmental 360, LLC to expand its environmental consulting, monitoring, and compliance capabilities. The deal strengthens Alliance's onsite field services and emissions/compliance monitoring offerings for industrial clients across the United States.