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Singapore's pollution standards index (PSI) tipped the scales at 401 at noon on Friday, the highest ever recorded, as the government warned that the lingering haze could last for weeks.
The National Environment Agency warned the elderly, pregnant women, children and those with heart and lung conditions to remain indoors as the index hit an historic high. An index reading above 300 is defined as hazardous and is regarded as potentially life threatening to the ill and elderly.