GENERAL KNOWLEDGE

Detailed explanation-1: -SO2 is a precursor to sulfuric acid, a major constituent of acid rain. It is produced by the combustion of coal, fuel oil, and gasoline (since these fuels contain sulfur), and in the oxidation of naturally occurring sulfur gases, as in volcanic eruptions. Volcanic plumes, rich in ash and SO2, are a hazard to aviation.

Detailed explanation-2: -Sulfur dioxide, SO2, is a colorless gas or liquid with a strong, choking odor. It is produced from the burning of fossil fuels (coal and oil) and the smelting of mineral ores (aluminum, copper, zinc, lead, and iron) that contain sulfur.

Detailed explanation-3: -The largest sources of sulfur dioxide emissions are electricity generation, industrial boilers, and other industrial processes such as petroleum refining and metal processing. Diesel engines are another major source, including old buses and trucks, locomotives, ships, and off-road diesel equipment.

Detailed explanation-4: -Carn and his team found that each year volcanoes collectively emit 20 to 25 million tons of sulfur dioxide into the atmosphere.

Detailed explanation-5: -Sources. SO2 is in emissions from power plants, metals processing and smelting facilities, and vehicles. Diesel vehicles and equipment were a major source of S02, but federal regulations to reduce the sulfur in diesel fuels has significantly lowered emissions.