New York Times: For much of the year, the Petronas Towers, the world’s tallest twin buildings, are gleaming landmarks visible far from the city center here. But last weekend, the 88-story structures were shrouded in a smoky haze that prompted doctors to warn people with respiratory problems to wear masks. The haze, attributed mostly to fires burning on the Indonesian island of Sumatra, has become a recurring summer blight, engulfing parts of Malaysia, Thailand, Brunei and Singapore, and leaving a litany of health…

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