What is the term for the smallest concentration of a gas detectable by most individuals through smell?

The term for the smallest concentration of a gas detectable by most individuals through smell is "Odor Threshold." This term refers specifically to the minimum concentration of a given substance that can be perceived olfactorily by a person.

Understanding odor thresholds is important in various fields such as environmental science, safety, and health, as it helps determine when a particular substance may become noticeable and potentially hazardous. It is crucial for recognizing the presence of gases that could indicate danger or health risks.

The other terms may seem related but do not specifically address the ability to detect a substance by smell. "Detection Limit" usually refers to the lowest amount that can be reliably measured using laboratory methods, rather than personal sensory perception. "Gas Concentration Ratio" typically describes the comparative levels of different gases rather than the perceptibility of one specific gas. "Smell Sensitivity Level" is not a commonly used term in scientific contexts and lacks the specificity and established usage of the term "Odor Threshold."