The air quality and commercial marine animals in the sea off Samet's Ao Phrao and nearby areas, affected by the July 27 oil spill, have returned to normal and contain no pollution, the director-general of the Disease Control Department said on Sunday.
Speaking in an interview with a radio programme, Dr Pornthep Siriwanarangsan said his department had collected air samples from the areas to monitor the concentration of benzene vapor and effects on human health every day soon after the leak incident.
Latest laboratory tests showed measured levels of benzene in outdoor air contained less than 0.1 parts of benzene per billion parts of air (ppb) (1 ppb is 1,000 times less than 1 ppm). Early tests conducted a few days after the leak indicated relatively high benzene, Dr Pornthep said, but they were still below 0.8 ppb.
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