The eruption of Mt. Pinatubo in the Philippines in 15 June 1991 is considered one of the world’s largest volcanic eruptions in the past century. The eruption produced an ash cloud that rose 28 miles (40 km) into the air blanketing Central Luzon with volcanic ash and pumice. Pyroclastic flows roared down the slopes of Mt. Pinatubo creating new volcanic deposits as much as 200 meters thick. On the same day, Typhoon Yunya crossed 75 km northeast of Mt. Pinatubo with rain and high winds bringing ashfall to many areas including Manila and Subic Bay and as far away as the Indian Ocean. Between 1991 and 1993, approximately 20 million tons of sulfur dioxide were injected into the stratosphere and spread around the world temporarily lowering global temperatures by one degree Celsius.
