What type of smell is associated with acidic pH levels?

A sour smell is commonly associated with acidic pH levels. This characteristic scent arises from the presence of organic acids or other acidic compounds that may be produced during the decomposition of waste materials in a septic system. When the pH drops below 7, the environment becomes more acidic, leading to the manifestation of this sour odor. Understanding this connection is crucial for professionals in the field, as it can help identify issues with system performance, material breakdown, or even potential system failures. In contrast, the other types of smells mentioned do not have a direct relationship with acidity, making the sour smell the most relevant in this context.