When weather conditions block the dispersal of smoke and other pollutants they concentrate and form a usually low-hanging shroud that impairs visibility and may become a respiratory health threat. The National Weather Digest. Haze is traditionally an atmospheric phenomenon in which dust , smoke , and other dry particulates obscure the clarity of the sky. Haze often occurs when dust and smoke particles accumulate in relatively dry air. Land degradation Light pollution Pollution from nanomaterials Noise pollution Radio spectrum pollution Urban heat island Visual pollution Space Debris. The main sources of the haze are Indonesia's Sumatra Island, Indonesian areas of Borneo, and Riau, where farmers, plantation owners and miners have set hundreds of fires in the forests to clear land during dry weather. Cleaner production Industrial ecology Pollutant release and transfer register Polluter pays principle Pollution control Pollution prevention Waste minimization Zero waste. From Wikipedia, the free encyclopedia. Since , haze has been a particularly acute problem in Southeast Asia.