Students of Mayflower Primary School taking precautionary measures by wearing masks as hazy skies returned as schools across Singapore reopened on Sept 28.
    Singapore

    S'poreans 'thank' Indonesia for clean air but...

    Studio Roosegaarde's Smog Free Tower creates smog-free zones by scrubbing the air of contaminants like carbon, which can be used to make pieces of jewelry.
    World

    Making gems... from smog