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The effects of volcanoes on the environment depend on climate patterns, the overall scale of the eruption and how much the gases spread. Potential effects of volcanic gases. Chronic exposure to H2S in geothermal areas was associated with increases in nervous system and respiratory diseases. Hazards closer to the volcano include pyroclastic flows, mudslides, gas and steam flows, earthquakes, air explosions and tsunamis. Sulfur dioxide, carbon dioxide and hydrogen are released in smaller amounts. Volcanic gases have claimed directly the lives of >2000 people over the past 600 years (Auker et al. The volcanic gases that pose the greatest potential hazard to people, animals, agriculture, and property are sulfur dioxide, carbon dioxide, and hydrogen fluoride.Locally, sulfur dioxide gas can lead to acid rain and air pollution downwind from a volcano. No studies on health effects of volcanic releases of halogen gases or metal vapors were located. Other common volcanic gases include carbon dioxide and sulfur dioxide, along with various hydrogen compounds. Gases derived from volcanoes have severe detrimental impacts on vegetation; direct exposure to volcanic gases over a long term period is lethal to most plant life (McGee, 1997). Volcanic eruption ejects sulfur dioxide gas into the atmosphere. Amounts of these gases vary widely from one volcanic eruption to the next. At low levels, gases can irritate the eyes, nose, and throat. The carbon dioxide released by volcanic activity is a greenhouse gas. That results in higher temperatures, an element of the greenhouse effect. Volcanic ash is often hot very close to the volcano but is cool when it falls at greater distances. Greenhouse gases are responsible for extreme weather and temperature increases around the world. Water vapor, the most common gas released by volcanoes, causes few problems. Another problem the environment is the ash that is released when a volcano erupts. About: Causes and Effects of volcanic eruption Introduction It is already known that volcanic eruption can cause cooling effects on earth by throwing sulfuric acid droplets and ash particles into the atmosphere that eventually block sunlight. Although gases usually blow away rapidly, it is possible that people who are close to the volcano or who are in the low-lying areas downwind may be exposed to levels that may affect health. Sometimes volcanic gases cause lingering detrimental side effects, such as acid rain. If the acid droplets are large enough, they prevent heat from escaping Earth's atmosphere. Volcanic gases are probably the least showy part of a volcanic eruption, but they can be one of an eruption's most deadly effects. 2013).Millions more people have been impacted by volcanic gas, with effects ranging from respiratory irritation to neurological impacts, to crop failure and famine. 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