Though it was feared that dust from the eruption might cool the Northern Hemisphere climate, the eruption ultimately had little long-term climatic effect. A breeze which blows at night down valleys and mountain slopes. As the slopes are cooled by radiation, air in contact with them cools also. The air then flows downslope because of its greater density. A health condition caused by the relatively small amount of oxygen in the air at high elevations, resulting in a decreased supply of oxygen to the blood.
Symptoms are headache, dizziness, shortness of breath.
The 1991 eruption of Mt. Pinatubo in the Philippines was the last volcanic eruption to have an impact on the global climate. The distinctively mushroom-shaped cloud of gas, dust, debris, water droplets and ice crystals that forms in the aftermath of a nuclear explosion. Its resembles cumulonimbus, the cloud that produces thunderstorms.