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    A haze has periodically wafted over southeast Asia for 20 years. But despite public health fears, the problem remains as opaque as the smoke itself.

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    Watch Vital Signs on CNN International:
    Wednesday January 21: 10:30, 17:30
    Saturday January 24: 06:30, 19:30
    Sunday January 25: 13:30
    Saturday January 31: 13:30
    Sunday February 1: 06:30, 19:30
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