What is name for far lowcontrast blueish landspace? What is the name of effect, that we see on far objects in outdoors ? These objects are low-contrast, foggy ? Is it only fog or some scattering ?
In computer graphics the effect is called "atmospheric scattering", that's sun light scattering from atoms and other particles in the atmosphere. In modern computer games atmospheric scattering is commonly modelled with Bruneton sky model by Eric Bruneton and is most prevalent in the clear sky due to long view distances, but also visible for distant objects on ground as you have observed.



Atmospheric scattering in Bruneton model is composed of Mie scattering and Rayleigh scattering. Mie scattering is mostly wavelength independent strongly anisotropic scattering from particles that are quite a bit larger than the wavelength of light (water droplets &amp; pollution in the atmosphere). Mie scattering results in effects like halo around the sun.

Rayleigh scattering on the other hand is wavelength dependent scattering from atoms in the atmosphere whose size is close to the visible light wavelength range. Rayleigh scattering is responsible of effects such as the blueish sky at noon and blueish tint of objects in the distance.