SES Qualified Source Test Individual and Observer (QSTI /QSTO) Program

Announcements and Updates

  • Live Online Proctored exams are now available and are administered by Meazure Learning. The examination costs are $200.00 per exam group, and each is a one-time purchase. There are no additional charges for proctoring or exam delivery. Re-take efforts will incur another $200.00 charge. See the section below entitled Guidelines for Meazure Learning Live Online Proctored SES Methods Knowledge Exams for more information.  To register for the online exam go to  login  to access the Scantron/Meazure Learning website.



  • Each of the methods group exams includes a few questions that require some calculations. The questions provide all the data needed for the calculations which are derived directly from the equations specified in the relevant methods. For either exam format (i.e., in-person or LOP), the candidate may NOT use a personal calculator, mobile/smart phone, or other personal electronic calculations device during the exam session. This revised policy for in-person exams will go into effect as of June 5, 2023.  After that time, the candidate must use the multifunctionsl calculator provided by the proctor for in-person exam sessions.


SES QSTI/QSTO Approval Procedures

The next SES QSTI/QSTO Applications Review Committee meeting is scheduled for Thursday January 11th,  2024. Please submit your completed application no later than close of business (EST) January 8th, 2024 in order to be in the queue for review at this meeting. Applications received after Monday January 8th, 2024 will be held over for review at the next monthly committee meeting.

The SES will issue approval documents to qualified applicants in the following methods groups:

  • Group 1 - Manual Gas Volume and Flow Measurements and Isokinetic Particulate Sampling Methods
  • Group 1a - Stack Gas Flow Rate Measurements Sampling Method
  • Group 2 - Manual Gaseous Pollutants Source Sampling Methods
  • Group 3 - Gaseous Pollutants Source Sampling Methods
  • Group 4 - Hazardous Metals Measurement Methods
  • Group 5 Part 75 CEMS RATA Testing


To apply for initial QSTI or QSTO approval, you must meet the following requirements:  

  • 1. Have at least 1 year of experience in the area selected for testing, using test methods in the relevant methods group.
  • 2. Pass one or more methods group exam. (Two-hour exam) (Click ETA registration to access the ETA web site and the register for a paper exam.) (Click  login  to access the Scantron/Meazure Learning website and register for an Source Evaluation Society online exam. Once registration for an exam has occurred, the exam must be taken within 6 months of registration.)​
  • 3. Submit a completed and notarized application for approval. You must have a wet ink signature on your application. You must also submit descriptions of at least two different field testing projects for each method group in which you participated and passsed the exam.  A project description could contain all exam groups.  In this case you would only need two project descriptions (Click SES QSTI/QSTO Approval Application and Renewal Policies and Procedures for more details on the application and renewal procedures). (Select the appropriate QSTI or QSTO application form listed below.)
  • 4. Submit at least three recommendations. At least two of the recommendations must be from people outside your current place of employment. (Click QSTI Reference Form to link to an approved recommendation form).


You should direct applications and associated information for SES QSTI or QSTO approval and any questions about these requirements or for information about the program to the SES QSTI/QSTO Administrator by email to the SES QSTI/QSTO Administrator, Theresa Lowe at

Note also the ECMPS AETB reporting requirements includes a provision for an email address be noted for the exam provider. This address is


  • The SES will maintain confidentiality for all application information and share such information only as necessary with no one but the SES QSTI/QSTO Committee. The SES QSTI/QSTO administrator will review and advise you if you should provide any additional information to complete your application. The Committee meets monthly to review applications, and SES posts the date of the next Committee meeting on the SES website. (Select SES Home page for the date of the next SES QSTI/QSTO application review meeting.) The deadline to submit your application and ensure that the committee acts on it at the committee’s next meeting is three days prior to the date of the scheduled meeting.

  • If you have any questions, please contact Theresa Lowe.

  • Thank you,
Theresa Lowe
SES QSTI/QSTO Program Administrator

Renewal Forms



QSTI Program Complaint/Suspension Guidelines

List of Qualified Stack Testing Individuals/Qualified Stack Testing Observers


Example project description 082022 v3.pdf21.03 KB
Guidelines for Meazure Learning Live Online Proctored SES Methods Knowledge Exams182.53 KB
Guide QSTI Exam Success v4.pdf126.78 KB