Layers of brownish haze visible above the horizon, particularly in the Definitions of the Arctic vary according to environmental, geographical, political, cultural and scientific perspectives. Some scientists define the Arctic as areas having a high latitude, long winters, short, cool summers,... More spring. Caused by pollution originating from outside the Arctic. The haze consists of tiny particles and droplets called aerosols, produced by volcanoes, dust storms and human activities such as burning fossil fuels. These pollutants affect Arctic ecosystems and food chains.