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An odor, odour or fragrance is the sensation experienced by humans and animals from the sense of olfaction, caused by one or more volatilized chemical compounds, generally at a very low concentration. The terms fragrance and aroma are often used to describe a pleasant odor, while malodor, reek, stench and stink are used specifically to describe unpleasant odors.
The strength of an odor is given by the sensitivity of the olfactory nerve. Substances like amines and thiols can be detected in very low concentrations. Volatile acids and halogens can also be detected at relative low concentrations.
People displaying anosmia (inability to perceive odor or a lack of functioning olfaction) have problems detecting certain odors, such as hydrogen cyanide (1 in 10 in the US), or even certain thiols like butyl mercaptan (1 in 1000 in the US), the skunk odor. Reasons for this condition range from genetic, to infection or olfactory nerve damage.
Dealing with odors
In general, an adsorbent is the best way to remove unwanted odors. For some, like ammonia/amines or thiols, chemical neutralization may be required.
Use of ventilation, like a fume hood, is necessary to remove harmful odors. Opening the window also helps a lot.