The process, carried out in stages, began at 10pm on Tuesday and took about 10 hours to complete.
State Housing, Local Government, Environment and Green Technology Committee chairman Datuk Tey Kok Kiew said water was sprayed in five locations in the farm to help release the trapped gas into the air.
He said gas readings indicated a drop from 500 parts per million (ppm) to about 30 ppm within 45 minutes.
The department also conducted gas readings every two hours in areas within a 3km radius of the factory, Tey said at a press conference at the operations centre here.
He said if the readings in the areas indicated the air was polluted, the release of the gas would be stopped.
Until 11.30pm, out of the 26 people initially treated at Hospital Melaka earlier in the day following the gas leak in the morning, 11 remained warded.
Tey advised the public not to panic as the situation was under control and reminded everyone to get their information from credible sources.
Meanwhile, Jasin district officer Datuk Anis Ali Hasan said as a precautionary measure, two temporary evacuation centres had been opened at SMK Dang Anum in Jasin and SMK Ayer Molek in Melaka Tengah. — Bernama
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