Various types of pollutants, including gases, are produced by combustion and industries, which increase their natural level in the atmosphere. The most important of these gases is SO 2 , a colorless gas produced by combustion of fossil fuels in the mining and refining industries. Oil, with UV rays and oxygen in the atmosphere, unites an atom of oxygen to form SO 3 , an unstable compound that easily reacts with water vapor, produces sulfuric acid, stays in droplets suspended in the air, Place to another, interacting with ACA vehicles In the atmosphere, which is produced by ordinary combustion processes, as well as cars, factories, and volcanic eruptions, ammonium sulphate, or its scientific name NH 4 (2SO 4 )), If the atmosphere is dry and suspended in the air, and appears in the form of fog, and once the rain falls until it melts to be acid rain, and not only to the industrial areas that cause this pollution because the currents of air travel from one place to another, Affected by the rains in recent years are Sweden, Britain, Canada, Scotland and Los Angeles.
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