on KLM Flight 867 after it flew through the ash cloud. 4 Kelud [59] 1990 6 Mount Pinatubo [60] 1991 847 Largest stratospheric disturbance since Krakatoa eruption in 1883, dropping global temperatures and increasing ozone depletion. 5+ Mount Hudson [61] 1991 4 Mount Spurr [62] 1992 4 Lascar [63] 1993 4?