In the past, Smaug was made from a mixture of smoke and sulfur dioxide from burning coal. Smaug the current, often from smoke generated by the combustion engine and the smoke from the plant. And react with sunlight, which caused. Form photochemical smog. (Photochemical smog) by smog caused by this type of atmosphere. Sunlight react with nitrogen oxides (NOx) and volatile organic compounds (volatile organic compound or VOC), nitrogen oxides are emitted by the air by the burning of fuel. From multiple sources such as cars, trucks, coal-fired power plants. And other industrial plants The city with the most vehicles. Tend to smoke more.
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