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Sulfur dioxide has natural sources account for only a very small percentage (about 1/10) compared to the artificial origin (from the industrial activity, traffic, etc.).Besides, power plants using fossil fuels for power generation is also emitted into air large amounts of NOx. In some countries, these emissions due to the thermal power plants account for 40%, while 60% were caused by transportation activities.An estimated 80% of sulfur oxide is caused by operation of the generators of energy, 15% due to the operation of burning of different industries, and 5% from other sources. For nitrogen oxide, 1/3 is by the activity of the energy machine, 1/3 is due to the action of burning fuel to transform into energy and the rest also do different sources.
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