THE FUTURE Odor control is of increasing importance in our lives, for examples, in cars, inside, and outside of buildings and factories. This environmental application area is particularly important because the E-nose can be trained to recognize hazardous chemicals as well as odors. Furthermore, with respect to the human nose, the E-nose does not fatigue as easily, can be placed in hazardous atmospheres, is less costly, and can travel easily into outer space. It also holds the promise of being much cheaper, smaller, and easier to use and maintain than a mass spectrometer.