Is the sky pink from pollution?

Impact of Pollution on Sky Colors

In a similar manner, the striking oranges and reds that characterize "clean" sunsets transform into softer yellows and pinks when dust and haze are present in the atmosphere. However, airborne pollutants do more than merely soften the colors of the sky; they also increase the scattering of both direct and diffused light, particularly when the sun is near the horizon.