Odor

Ozone (), also called trioxygen, is an inorganic molecule with the chemical formula ''''''. It is a pale-blue gas with a distinctively pungent odour. It is an allotrope of oxygen that is much less stable than the diatomic allotrope , breaking down in the lower atmosphere to (dioxygen). Ozone is formed from dioxygen by the action of ultraviolet (UV) light and electrical discharges within the Earth's atmosphere. It is present in very low concentrations throughout the atmosphere, with its highest concentration high in the ozone layer of the stratosphere, which absorbs most of the Sun's ultraviole

thumb|upright=1.25|"Smell", from Allegory of the Senses by Jan Brueghel the Elder, [[Museo del Prado ]]

Chinese fermented tofu with a strong odor; usually sold at night markets or roadside stands as a snack, or in lunch bars as a side dish, rather than in restaurants

ammonium carbonate used in the past to restore consciousness after fainting

species of insect

Osmophobia or olfactophobia refers to a fear, aversion, or psychological hypersensitivity to odors. Osmophobia seems to be a consistent part of the patient’s migraine history, but additional criteria are needed to differentiate it from episodic tension-type headache (ETTH). The phobia generally occurs in chronic migraine sufferers who may have odor triggered migraines.

lowest perceivable odor concentration

top-secret malodorant

common odor found in new cars