Partially oxidized organic compounds, i.e., those containing carbon, hydrogen, and oxygen atoms, and optionally other heteroatoms, are often referred to as “oxygenates” because they contain O-atoms as well as a C-atom skeleton. These enter the atmosphere as emissions from various industrial and transportation-related operations, evaporation and release from home usage of certain products, and release from vegetation. They are also formed in the atmosphere as oxidation products of all hydrocarbon emissions that enter the atmosphere from mobile and stationary sources as well as natural emissions from plants and animals. The common oxygenates consist of the alcohols (ROH), ethers (ROR), aldehydes (RCHO), ketones [RC(O)R], esters [RC(O)OR], and acids [RC(O)OH] together with N-atom-containing oxygenates and other less abundant classes of oxygen-containing organic compounds. The use of alternative fuels is increasing and is anticipated to continue to grow in the future. Many of these alternative fuels are oxygenates: methanol, ethanol, butanol, fatty acid methyl esters, and other biofuels. Thus, the scientific community is interested in identifying the important sources and sinks for these compounds. As with the hydrocarbons, the oxygenates serve as fuel for the reactions that generate ozone and other air pollutants within the troposphere. In illustration, consider the influence of the very common and important oxygenate, formaldehyde (CH2O).