What is aqi exam hold?

There's no standardized exam known as an "AQI exam." AQI refers to Air Quality Index. Therefore, an "AQI exam" likely refers to a test or assessment related to air quality, but the specifics would depend entirely on the context where you encountered this term.

To understand what kind of exam it is, you'd need to provide more information, such as:

* Where did you see this term? (e.g., a school syllabus, a job posting, a website)

* What is the subject matter? (e.g., environmental science, engineering, public health)

With more details, I can give you a more accurate answer.