Pet urine odor and other animal related odor problems result from alkali odors (ammonia, Trimethylamine), and acidic odors (Hydrogen Sulfide, Methyl Mercaptan) emitted from urine and feces. When your pet releases urine, PH property of urine is alkali; however, after being exposed to air, it changes from alkali to acidic. These odors are not only bad for humans but also for your pets. The most important fact is that pet odor control should be carried safely so that both of you can live comfortable.