Glaciers preserve atmospheric species that are deposited as snow accumulates over time, creating invaluable records of past atmospheric conditions. Researchers extract ice cores from glaciers and analyze them to reconstruct historical deposition of aerosols. These records are essential for putting present-day changes into perspective and understanding the factors that drive them. In this presentation, I will summarize results from some of my published ice-core studies. Specifically, I will discuss the deposition history, emission sources, and influence of atmospheric circulation on the deposition of trace elements in a Tibetan ice core, as well as atmospheric black carbon and ammonium in an ice-core record from the Wrangell-St. Elias Mountain Range in Alaska.