On clear and chilly Monday evening I was walking out on company parking place, half an hour after sunset. In the opposite side of sun, earth shadow and belt of Venus were rising above horizon. The sky was strangely colored around sun, in a large area.
Light pink hue was easily visible. Normally during sunset sky turns first to orange and then red, even deep red. I remembered that earlier this year there was a volcanic eruption at Mount Kasatochi, located at Aleutian islands.
I assume this event could cause the colors, but I sill am not 100% sure... During the autumn reports of such colorful sunsets are received from Sweden. Many reports also have been coming from central Europe.
Before this eruption (if I correctly remember) was the famous mount Pinatubo eruption. Huge amount of aerosols and small dust particles were blown into upper atmosphere.