formaldehyde
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Because it survives for only a short time, unusually large amounts of formaldehyde can act as a chemical fingerprint showing that methane destruction is actively taking place.
From Science Daily ● Sep. 15, 2026
Beyond their carbon footprints, they emit fine particulate matter, linked to a range of heart and lung problems; nitrogen oxides, which aggravate respiratory disease; and hazardous air pollutants including mercury, formaldehyde and benzene.
From Barron's ● Aug. 7, 2026
Milk, for example, would be mixed with formaldehyde to sweeten it when it went rancid.
From The Wall Street Journal ● Jun. 23, 2026
That discovery immediately caught their attention because formaldehyde is produced when methane breaks down in the atmosphere.
From Science Daily ● May 10, 2026
The embryos have been pickled; the scent of formaldehyde is very strong.
From "Cat's Eye" by Margaret Atwood
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It is made in small batches and is a 10-free polish, meaning its base is made without formaldehydes, added fragrance and other chemicals commonly found in nail polish.
From Los Angeles Times ● Oct. 14, 2022
Another popular brand for sensitive skin is Vanicream because it’s free of fragrances, parabens, formaldehydes, and other irritating ingredients.
From Slate ● Nov. 6, 2018
What she found terrified her: petrochemicals, formaldehydes and flame retardants in everyday household products from floor cleaners to mattresses.
From Forbes ● May 27, 2015