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Sydney, Saturday morning, smothered in a blanket of smoke from the huge bushfires still burning to the west of the city.

Australian authorities issued health warnings as the haze pushed pollution levels to 15 times above normal.

(SOUNDBITE)(English) DOCTOR RICHARD BROOME, NEW SOUTH WALES HEALTH DEPARTMENT SPOKESMAN, SAYING:

"We would recommend that everybody avoids outdoor physical activity and people who may be particularly sensitive to smoke so those are people with asthma or chronic heart and lu