What does sulfur dioxide emissions from volcanoes do?

The impact of the emission of sulfur dioxide on the environment depends on three points. The first point is the amount of gas the volcano lets out into the atmosphere; the second is whether the gas is released into the stratosphere or troposphere; the third depends on what global or regional wind and weather pattern is present during the disperse of the gas. The sulfur aerosols block the sunlight from hitting the earth therefore causing a slight temperature drop. The cooling of the earth’s surface is only a short-term climate change because the aerosols leave the atmosphere quickly.
Volcanic sulfur dioxide emissions can accelerate chemical reactions that cause the disintegration of the ozone layer, creating very low ozone levels. This is what happened on Mount Pinatubo in 1991.Sulfur dioxide emissions can also cause pollution by reacting with the oxygen, sunlight, water and dust particles forming volcanic smog. The eruption of Mount Pinatubo clearly showed the warming of the stratosphere, and cooling the troposphere.