The common belief that pollution causes the vivid colors present in sunrises and sunsets is actually not entirely true. A colorful twilight after say, a volcanic eruption, may be attributed to dust particles. However, if all colorful twilight evenings or mornings were caused by pollution, than the worlds biggest cities (like New York) would be known for their beautiful sunsets. In fact, pollution dulls the color of sunsets. In fact, colorful sunsets are produced when a cloud is high enough in the sky to receive unadulterated sunlight, in effect, light that has not yet suffered color loss by passing through the atmospheric boundary layer.
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