Theodor D. Sterling and Associates, Ltd.

Theodor Sterling Associates Ltd (TSA) is a multi-disciplinary consulting firm providing indoor air quality, environmental and occupational hygiene/safety consulting services for clients throughout North America for more than 30 years. 

The extensive experience of TSA related to indoor air quality has enabled the development of a comprehensive proprietary Proactive IAQ Management Program and related IAQ services. The TSA Proactive IAQ Management Program is designed to build on and be integrated with the existing O&M programs in the buildings managed by our clients. 

Theodor Sterling Associates Ltd. is recognized as an industry leader in the field of Indoor Air Quality. Our IAQ management team’s experience with indoor air quality audits is unparalleled. Members of our team are recognized as leaders in the field of indoor air quality and are regularly called upon to speak at building industry and engineering events and to advise on standards, regulations, and building code development. 

Our TSA team provides clients access to the worlds leading experts/scientists on indoor environments. Our services provide the real estate industry with cost-effective verifiable problem detection combined with clear comprehensible consulting advise, enabling building owners, managers, and operators to make decisions and implement programs related to IAQ performance of facilities for which they are responsible. 

In the summer of 2001, significant changes were made to Theodor Sterling Associates to permit us to provide occupational hygiene and safety consulting services. These additional team members brought the ability to handle all your occupational hygiene and safety needs to the table but also complement the existing structure of TSA via their experience with indoor air quality and mould consulting.