At what concentration of NH3 is odor detectable by most people?

The concentration of ammonia (NH3) at which odor is detectable by most people is approximately 50 parts per million (ppm). This threshold is significant because it reflects the sensitivity of human olfactory receptors to ammonia, which is known for its pungent smell. When the concentration reaches around 50 ppm, most individuals can easily identify the presence of ammonia due to its strong, irritating odor.

Understanding this detection threshold is crucial for safety and health considerations, particularly in environments where ammonia may be present, such as industrial settings or laboratories. At lower concentrations, although some individuals may detect the odor, the average person's perception typically aligns with the 50 ppm mark. Therefore, being aware of this concentration can help in monitoring and managing exposure to ammonia in various situations.