Smokiness is a term used to describe the presence of smoke in the air. HAZE is a synonym for smokiness, and is defined as a dry, dust-filled or sandy atmosphere that reduces visibility. HAZE can be caused by smoke from burning materials, such as wood, coal, or oil, or by dust particles suspended in the air. HAZE can also be caused by pollutants in the air, such as sulfur dioxide, nitrogen oxides, and ozone.