Hazes are a type of atmospheric phenomenon that can be caused by a variety of sources. Fogs, films, mists, and smogs are all types of hazes. Fogs are composed of tiny water droplets suspended in the air, while films are thin layers of liquid or solid particles that form a coating on surfaces. Mists are similar to fogs, but are composed of even smaller droplets, and smogs are a combination of smoke and fog. All of these forms of hazes can reduce visibility and cause health problems.