The longest continuous record of in situ stratospheric aerosol measurements in the world has been completed at Laramie, Wyoming, 1971-2020, comprising nearly 400 individual balloon flights. These measurements since 1989 are contained in this digital archive. In addition to the flights from Laramie, there are over 100 flights from McMurdo Station, Antarctica, 45 flights from Kiruna, Sweden, and a handful of flights from 13 other locations throughout the world stretching from 45˚S to 68˚N. Scroll to the bottom of this page for the links accessing these data grouped into Mid-latitude, Polar, and Tropical. The measurements from Laramie from 1971 – 1988 are available on the data base of the Network for the Detection of Atmospheric Composition Change at the Network for the Detection of Atmospheric Composition Change