Qualified Source Testing Individual (QSTI)
The Qualified Source Testing Individual (QSTI) program is conducted by the Source Evaluation Society (SES) as a service to the source testing industry. There are four groups of tests representing all applicable methods for source testing (Group I, Group II, Group III, and Group IV). Information on those tests can be found at the link below:
QSTI - Information On Group Tests
The goal of the SES QSTI exam and abilities assessment is to determine whether the candidate demonstrates knowledge and the ability to apply source testing methods and fundamental engineering and chemistry principles in a manner consistent with that of a field test team leader. In addition to thorough and practical knowledge of source testing methods, those principles include an understanding of elementary physical gas laws and chemistry, basics of safety and hazardous material handling, and primary theories of source testing (e.g., isokinetic and proportional sampling). The candidate is expected to exemplify and demonstrate professional and ethical conduct not only during the exam process but also in representing SES as a QSTI.
This program is consistent with the mission of SES to advance the applied sciences relating to source evaluation with respect to air pollution and air pollution control by:
- promoting the development of concepts and techniques relating to the field;
- encouraging related professional development and knowledge;
- striving to ensure the highest professional standards by its members.
Currently the Project Managers, District Managers, Operations Director, IT/Lab Director, and Technical Director are QSTI certified.



