During sunsets, we experience a variety of colors in the red-orange-yellow end of the color spectrum: Instead of seeing all colors equally, we can only perceive colors with long wavelengths when the sun reaches low points in the sky. Therefore, vibrant displays of red hues are typically observed when the sun is at or slightly under the horizon line. Furthermore, a sunset may appear particularly red when there is a high concentration of volcanic ash, dust, sand or other particles in the air, due to a phenomenon called Rayleigh scattering, which explains how short wavelengths of light typically scatter with most efficacy.
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