Ground level measurements of naturally occurring atmospheric ions were performed in a remote desert area of southeastern Arizona and on top of Mount Washington in New Hampshire. High resolution measurements of the positive ion spectrum revealed the presence of the NH+4.(H2O)n ion family and a stable core ion at mass 80. Two more variable peaks at mass 60 and 94 were also observed at both locations. The negative spectrum was dominated by ion peaks corresponding to the ion family NO-3.(HNO3)m.(H2O)n. The variability of the observed ion spectra and meteorological effects are discussed and compared to measurements from the previous year.