Industrial pollution has been a problem since the very beginning of industrial development in Thailand. As early as 1964, workers in a Bangkok factory were suffering from manganese poisoning. From 1967 onwards, unplanned and unregulated use of natural resources for industry became an increasingly severe and widespread problem. In 1972-1973, discharge of wastewater from a factory on the Mae Klong River, and the subsequent fish kill and water quality problems were a stimulus for the birth of the environmental movement in Thailand. From 1977 onwards, diverse forms of pollution became more apparent to society with work-related illnesses such as lead poisoning and asbestosis becoming increasingly common (GSEI, 2002). In 1993, 12 electronic workers from the Northern Region Industrial Estate in Lamphun Province died mysteriously after their involvement in a process that repeatedly exposed them to chemicals. Recently, the result of a blood test on electronic workers from the same industrial estate who often complain of headache and fatigue revealed abnormally high levels of some heavy metals (GSEI, 2003).