The haze first became a considerable disruption to daily life in Malaysia in April 1983. The cause of the haze is uncertain, which has led to speculation that suspended ash particulates from volcanic eruptions, suspended smoke particulates from large-scale forest fires, open agricultural burning in neighbouring countries, as well as local agricultural burning had caused the haze.[1] The disruption happened again in August 1990, from June to October 1991, and has recurred every year since 1992, plaguing the months of August, September, and October. The effects of the haze reached their zenith in 1997 when the cause of the haze was confirmed to be forest and plantation fires in Southern Sumatra, Kalimantan, and some other islands of Indonesia as the sky remained dull with pollution from August until November of that year.