X-ray photoelectron spectroscopy was used to investigate the corrosion products formed on silver (Ag) samples that were exposed at various outdoor sites. Silver chloride (AgCl) and silver sulfide (Ag2S) were identified, as well as silver sulfite (Ag2SO3) and silver sulfate (Ag2SO4). The presence of these oxidized sulfur species on field-exposed Ag samples has been contested. Yet, evidence here suggests that Ag2SO3 is a stable intermediate in the formation of Ag2SO4. Furthermore, the presence of alkali cations, such as Na+, correlates with the final oxidation state of the sulfur species found on the Ag samples. When cations were present, Ag2SO4 was the final state, whereas Ag2SO3 was found in the absence of alkali cations. In addition, silver carbonate (Ag2CO3) was identified on samples exposed at one site with higher altitude. Here, we present for the first time the detection of Ag2SO3, in addition to Ag2CO3, on field-exposed Ag. These findings improve the ability to use Ag as an atmospheric corrosion monitor for the simultaneous detection of AgCl and Ag2S as well as Ag2SO3 and Ag2SO4. (C) 2015 The Electrochemical Society. All rights reserved.