The Bangkok Metropolitan Administration has received 7000 complaints about noise pollution in the last three years with a third saying they were severely affected by noise generated by factories and construction sites. According to the Thailand Environment Institute (TEI) noise causes damage to hearing and causes mental health problems. A new clamp down on noise pollution is being announced with 38 new noise control units, tripling current capacity. The units will be used to deal with areas where significant noise pollution occurs and action taken against offenders. Some companies are taking their responsibilities seriously. Kijja Ruangthai, advisor on health and safety matters to Siam Cement says that noise pollution can destroy hearing, lead to high blood leves, heart disease, lack of balance and mental health problems. Companies have a duty to make sure that their operations do not cause noise levels that damage people's health.