City haze is a term used to describe the air pollution caused by the burning of fossil fuels in cities. It is often referred to as SMOG, which is an acronym for smoke and fog. SMOG is a combination of pollutants such as nitrogen oxides, sulfur dioxide, and particulate matter that can cause respiratory problems and other health issues. City haze is a major environmental issue in many cities around the world, and efforts are being made to reduce its effects.