Haze can lead to smog. So there:
Smog, a word coined by London physician Harold Des Veaux in 1905, was originally intended to describe a natural fog contaminated by smoke. Today it has become a synonym for general air pollution. In Los Angeles, as in many other large cities, the smog is a photochemical type, characterized by high levels of ozone and poor visibility. Haze occurs when tiny particles of dust, smoke, salt or pollution dispersed in the air, are present in large enough quantities to reduce visibility due to the aerosols scattering incoming light.
Haze particles occur naturally, as they do in the Smoky Mountains, or they can be generated by human activity, such as the burning of hydrocarbon fuels. In an urban environment, under a strong temperature inversion and stagnant conditions, a haze can quickly deteriorate into a serious smog episode.
http://articles.chicagotribune.com/2002-04-04/news/0204050047_1_haze-smog-urban-environment