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Habituation

The inability or decreased ability to perceive an odour as continued exposure to that odour increases over time.  An odour may initially be strongly detectable but may diminishes completely in…

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Hazardous Air Pollutants (HAPs)

Pollutants released into the atmosphere as particles and volatile organic compounds (VOCs) — including the known carcinogens of benzene and toluene — from a variety of sources such as vehicle…

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Hedonic tone

Represents the pleasantness or unpleasantness of an odour.  It is subjective to each person and therefore may evoke an emotional response depending on experiences with that odour.  It measures how…

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Hyposmia

Hyposmia is the temporary or permanent partial loss to perceive odour. This may be due to infections, flu or cold or head trauma. This may lead to a raised detection…

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