Low visibilities refer to the lack of clarity or clearness in the surrounding environment. There are different synonyms that can be used to replace the phrase low visibilities, depending on the context in which the phrase is being used. Some synonyms include: fog, haze, mist, smog, and murkiness. Fog and mist both refer to the small water droplets that hang in the air, obscuring visibility. Haze refers to the atmospheric pollution that makes the surroundings blurry. Smog is a combination of smoke and fog, typically found in urban areas. Murkiness refers to the blurry and dark surroundings, caused by insufficient light. These synonyms can be interchanged with the phrase low visibilities to convey the same meaning.