It may not look like there is much going on in this picture but unfortunately there are not many techniques to capture smell with a camera! After a crime scene or other type of Biohazard situation has occurred, the structure will tend to have a very unpleasant odor. That tiny green machine in the room is called an Ozone Machine. The machine produces Ozone which removes odor by destroying the molecules, bacteria, viruses, and spores that cause unpleasant smells. The machine is also used to eliminate the "smokey" smell after a fire damage. It works very well on smoke damaged clothes and contents as well!