Another word for things that effect visbility

This usually occurs when temperatures are below 0В вЊ (32В вЏ). With fog, occasional freezing drizzle and snow can occur. This has implications for sensors such as thermal imagers (TI/ FLIR) operating in the far-IR at wavelengths of about 10 Ојm, which are better able to penetrate haze and some smokes because their particle size is smaller than the wavelength the IR radiation is therefore not significantly deflected or absorbed by the particles. Fog and mist are generally assumed to be composed principally of water droplets, haze and smoke can be of smaller particle size. The international definition of fog is a visibility of less than 1В km (3,300В ft) mist is a visibility of between 1В km (0.62В mi) and 2В km (1.2В mi) and haze from 2В km (1.2В mi) to 5В km (3.1В mi). A realistic definition should consider the fact that the human visual system (HVS) is highly sensitive to spatial frequencies, and then to use the Fourier transform and the contrast sensitivityДЇunction of the HVS to assess visibility. Visibility perception depends on several physical and visual factors. This means that in the cleanest possible atmosphere, visibility is limited to about 296В km. At sea level, the Rayleigh atmosphere has an extinction coefficient of approximately 13.2 Г— 10 в€’6 m в€’1 at a wavelength of 520В nm. The visual contrast, C V(x), at a distance x from the black object is defined as the relative difference between the light intensity of the background and the objectД¬ V ( x ) = F B ( x ) в€’ F ( x ) F B ( x ) To define visibility the case of a perfectly black object being viewed against a perfectly white background is examined. Blizzards and ground blizzards (blowing snow) are also defined in part by low visibility. Heavy rain (such as from a thunderstorm) not only causes low visibility, but the inability to brake quickly due to hydroplaning. The same can happen in a sandstorm in and near desert areas, or with forest fires.

Fog and smoke can reduce visibility to near zero, making driving extremely dangerous.

Various weather stations report this as haze (dry) or mist (moist). However, visibility is often reduced somewhat by air pollution and high humidity. In extremely clean air in Arctic or mountainous areas, the visibility can be up to 240 km (150 miles) where there are large markers such as mountains or high ridges. On clear days, Tel Aviv's skyline is visible from the Carmel mountains, 80 km north

Another word for things that effect visbility