New Delhi: Delhi remained covered in dense fog and heavy pollution for another day on Friday, badly affecting daily life and air travel. Low visibility combined with toxic air led to major flight disruptions, while weather officials warned that conditions may worsen over the weekend.
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For years, scientists have warned that bird flu - better known as H5N1 - could one day make the dangerous leap from birds to humans and trigger a global health crisis. Avian flu - a type of influenza - is entrenched across South and South-East Asia and has occasionally infected humans since emerging in China in the late 1990s.
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