The color of clouds can also be affected by the presence of haze or dust in the atmosphere. Haze is made up of tiny particles of dust, smoke, or pollen. These particles scatter sunlight, making clouds appear more yellow, orange, or redAt sunrise and sunset, the colors of clouds can be even more dramatic. This is because the sunlight has to travel through more of the atmosphere to reach the clouds. As the sunlight travels through the atmosphere, it is scattered by the air molecules. The shorter wavelengths of light, such as blue and violet, are scattered more than the longer wavelengths, such as red and orange. This is why clouds often appear red or orange at sunrise and sunset

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