Very reactive organic compounds that contribute to local and regional ozone production, and also act as the precursors of peroxyacetyl nitrates. Their major atmospheric fate is reaction with hydroxyl radicals or photolysis.
a class of organic compounds which have an end group with a carbon and oxygen double bonded to the same carbon. These compounds, related to formaldehyde, are cross- linkers, mutagens, and carcinogens. Malonaldehyde, created in the breakdown of peroxidized fats, is also carcinogenic, and an extremely potent cross-linker. Acetaldehyde is made from alcohol in the liver (the acetaldehyde is a major reason alcoholics have such heavily wrinkled skin) and is found in cigarette smoke and smog. Most aldehydes autoxidize, producing damaging free radicals.