Noun
atmospheric perspective (uncountable)
(art) A technique in which an illusion of depth is created by painting more distant objects with less clarity, and with a lighter tone
Unlike Giotto, however, Masaccio uses linear and atmospheric perspective, directional light, and chiaroscuro, which is the representation of form through light and color without outlines. Source: Internet
This effect, long recognized by Leonardo da Vinci and other painters, is called aerial perspective or atmospheric perspective. Source: Internet