another word for things that effect visbility

The international definition of fog is a visibility of less than 1 km (3,300 ft) mist is a visibility of between 1 km (0.62 mi) and 2 km (1.2 mi) and haze from 2 km (1.2 mi) to 5 km (3.1 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 sensitivityįunction 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 296 km. At sea level, the Rayleigh atmosphere has an extinction coefficient of approximately 13.2 × 10 −6 m −1 at a wavelength of 520 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 objectĬ V ( x ) = F B ( x ) − 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