PUTRAJAYA: Authorities detected methyl mercaptan gas in Pasir Gudang during the height of the crisis when people experienced breathing difficulties in the area.
Energy, Science, Technology, Environment and Climate Change Minister Yeo Bee Yin said the presence of the gas was an anomaly.
She said it could cause averse effects on children as well as those with health conditions like asthma.
Also detected in Pasir Gudang was acrylonitrile and acrolein gases.
However, the minister said the three gases were not detected in the blood samples of the victims.
"The ministry has initiated immediate measures to dispose factors that contribute to the presence of the gases.
"Authorities are also continuing enforcement efforts and to monitor chemical factories in Pasir Gudang," she said at a press confrence on Friday (June 28).
According to statistics, there are 2,005 licensed factories in Pasir Gudang, of which 250 are chemical factories.
Health Minister Datuk Seri Dr Dzulkefly Ahmad said as of June 27, a total of 748 cases of breathing difficulties were reported in Pasir Gudang, with 709 treated as outpatients while 39 required hospitalisation.
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