I-A Jeffrey S. Gaffney, et al. The description above is based on the press release summary.
Aldehydes are much more reactive in the atmosphere than the alcohols they are made from.
When its cold, its lifetime is longer. PAN is highly toxic to plants and is a powerful eye irritant. It has been measured in many areas of the world, indicating that it can be carried by winds throughout the globe. Environmentally, ethanol is very much a mixed bag. It takes more energy to make a gallon of ethanol than the energy you get when you burn it.