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Air fresheners from Febreze. Air fresheners are products designed to reduce unwanted odors in indoor spaces, or to introduce pleasant fragrances, or both. They typically emit fragrance to mask odors but may use other methods of action such as absorbing, bonding to, or chemically altering compounds in the air that produce smells, killing organisms that produce smells, or disrupting the sense of ...
An old sewer gas chimney in Stonehouse, Plymouth, England, built in the 1880s to disperse sewer gas above residents. Sewer gas is a complex, generally obnoxious smelling mixture of toxic and nontoxic gases produced and collected in sewage systems by the decomposition of organic household or industrial wastes, typical components of sewage.
The threshold value is the concentration at which an aroma or taste can be detected (air, water and fat). The recognition threshold or arousal threshold of olfactory neurons is the concentration at which you can identify an odor (air, water and fat). The odour activity value is the concentration divided by the threshold.
To the average consumer, formaldehyde may be best known as an embalming agent. But this naturally occurring chemical is a major industrial staple, used in many consumer goods, including cleaning ...
[66] [67] At concentrations above 0.1 ppm in air, formaldehyde can irritate the eyes and mucous membranes. [68] Formaldehyde inhaled at this concentration may cause headaches, a burning sensation in the throat, and difficulty breathing, and can trigger or aggravate asthma symptoms. [69] [70] The CDC considers formaldehyde as a systemic poison.
Another study showed that ozone can react with other constituents, namely cleaning agents to increase pollutants such as formaldehyde; this study's objective was testing for health risks associated with indoor use of cleaning products and air fresheners as opposed to adverse health effects of air ionisers. [17]
Concerns over a chemical found in furniture and flooring have put the public on alert over formaldehyde. Long-term exposure to the chemical has often been linked to cancer in humans.
The city's mayor tries to take on the smell as he walks into the scene with a tree-shaped air freshener tied to his nose. But the stench proves too powerful when his air freshener turns into soot. [21] In the Sloth scene in the 1995 film Seven, several 'Little Tree' air-fresheners were suspended in a room to mask the smell of the emaciated body ...