The effects of the 1991 eruption were felt worldwide. It ejected roughly or of magma, and of SO2, bringing vast quantities of minerals and toxic metals to the surface environment. It injected more particulate into the stratosphere than any eruption since Krakatoa in 1883. Over the following months, the aerosols formed a global layer of sulfuric acid haze. Global temperatures dropped by about in the years 1991-93, and ozone depletion temporarily saw a substantial increase.