An orange sky can be caused by several factors, including atmospheric conditions, pollution, and the position of the Sun.
Atmospheric Conditions: During sunrise or sunset, the Earth's atmosphere scatters sunlight in different ways depending on the angle at which the light passes through it. When the Sun is low on the horizon, its light has to pass through a larger portion of the Earth's atmosphere. This causes the shorter blue and green wavelengths of light to scatter more, while the longer red and orange wavelengths are less scattered. As a result, the sky can appear orange or reddish during these times.
Pollution: Air pollution, such as smog or haze, can contribute to an orange sky. Particles and pollutants in the atmosphere can scatter light and alter its color. In heavily polluted areas, especially those with high levels of particulate matter, the sky may appear more orange or brownish.
Dust and Aerosols: Dust storms, volcanic eruptions, or wildfires can release large amounts of fine particles and aerosols into the atmosphere. These particles can scatter sunlight and cause the sky to take on an orange or hazy appearance.
It's important to note that an orange sky can also be a temporary and localized phenomenon, occurring under specific circumstances. Different combinations of atmospheric conditions, pollution, and natural events can contribute to variations in the color of the sky.