If a rat dies near a steam pipe, the body wonât dry and the smell can be horrible for weeks. The odor from a dead mouse may last only a day or two. In fact, there may be no noticeable odor from a single dead mouse but several dead mice in the same area could smell for a few days.
Most popping or crackling sounds in an audio system come from a bad or dirty connections. Sometimes they do come from a faulty unit or component, but in most cases it is a connection issue.
With exhaling it is more likely to be pneumonia, other infections or blockage. Crackling on exhaling may also be a result of pulmonary edema. Pneumonia. Pneumonia is an infection that can in some cases be fatal if untreated, which is why it is so important to seek medical attention as soon as you note the sound.