The Reduced-Scattering of Atmospheric Particles During a Sunset (Rayleigh's Scattering Law)
Exploring the relationship between color, light, and human intervention, this hyper realized series of cloud formations depicts the unearthly beauty of the dusk-light sky, courtesy of pollution created by both nature and humans.  Normally, the colors of the sky result from sunlight interacting with molecules in the air, primarily nitrogen and oxygen, which cause it to be deflected in all directions. All wavelengths of light are scattered, but they are not scattered equally. Colors with shorter wavelengths are scattered the most: violet, followed by blue, then green, etc. To get a red sky, the atmosphere needs aerosols, which are solid or liquid particles suspended in the air originating  from both natural processes and human activity. Human-generated aerosols, such as soot emitted by internal combustion engines in cars and trucks and burning fossil fuels releases sulfur dioxide gas into the air, which then turns into sulfuric acid aerosols. Most particles suspended above cities scatter radiation, preferentially removing the cooler violets and blues in the spectral palette and enhancing the red.