Accelerated tests such as ASTM B117 are commonly used to evaluate the susceptibility of materials and structures to atmospheric corrosion. However, the results of these tests often do not correlate well with field exposures. Discrepancies can include the form of corrosion and the relative ranking of different materials, which makes lifetime prediction from such results often difficult. It is possible that naturally-generated reactive chlorine species present in the environment are absent in these controlled chambers, yet play a crucial role in field corrosion. Ag is used in this study because the extent of reaction can be assessed easily through galvanostatic reduction of the reaction product. To differentiate the proposed reaction pathways for the generation of reactive chlorines, several approaches have been taken. Nano-sized chloride particles have been deposited from aerosols onto Ag surfaces that were subsequently exposed to conditions with various combinations of humidity, ozone, and UV light. In a separate approach, Ag was exposed simultaneously to bulk chloride solutions containing peroxide and to UV light. The roles of UV and oxidizers such as ozone and peroxide in the corrosion process are being investigated. A new approach for galvanostatic reduction has been developed to differentiate Ag oxide and chloride products.