ASSEN Testing Labs is a specialized environmental and occupational health laboratory located in Toronto, Canada. With broad-based technological expertise in environmental health focused research, our objectives are to provide high quality analytical services in identifying ultra trace level contamination and to develop

innovative techniques in chemical sampling, monitoring and emission testing. We specialize in mass spectrometry and chromatographic solutions in characterizing and detecting toxic airborne organics as well as odorous compounds.

Backed by our stringent procedures and our proven data collection, analysis and reporting capabilities, we provide accurate and rapid services for a very diverse clientele in support of:

Indoor and ambient air quality assessments and studies
Workplace investigations
Occupational exposure evaluations
Odour determinations
Industrial process emissions
Landfill sites emission characterization
Biological monitoring
Vapour intrusion evaluations
Leadership in Energy and Environmental Design (LEED) Certification


We also provide specialized services for testing of gases and sulphur compounds.

Accredited by the American Industrial Hygiene Association (AIHA) in the Industrial Hygiene Laboratory Accreditation Program (IHLAP) as documented by the Scope of Accreditation Certificate, CASSEN conforms and operates strictly according to the requirements of the ISO17025 Quality Standard. In addition, CASSEN also participates in the United Kingdom’s Workplace Analysis Scheme for Proficiency (WASP) program as well as AIHA’s Industrial Hygiene Proficiency Analytical Testing (IHPAT) Program.