What visual phenomenon occurs during the presence of haze?

The phenomenon that occurs during the presence of haze is primarily the scattering of shorter light wavelengths. Haze consists of tiny particles and droplets suspended in the air, which can scatter light. Shorter wavelengths of light, such as blue and violet, are scattered more effectively than longer wavelengths, such as red and yellow. This scattering process is what contributes to the bluish tint that can be observed in the atmosphere when haze is present.

While other choices may relate to atmospheric conditions, they don't directly address the phenomenon of haze itself. Enhanced visibility is typically the opposite effect, as haze generally reduces visibility due to these particles obstructing the clarity of the air. Colorful sunsets, while they can occur in hazy conditions due to scattering, are not a defining characteristic of haze itself. Reduction in cloud formation doesn’t relate to the presence of haze, as haze can exist regardless of cloud cover. Thus, the scattering of shorter light wavelengths accurately defines the visual effects associated with haze.