Sydney bushfire smog 'like being a heavy smoker'

Sydney is cloaked in a thick haze as smoke from bushfires burning across New South Wales drifts into Australia's most populated city.

Landmarks like the Sydney Harbour Bridge and Sydney Opera House have disappeared into the smog and people are being warned to say indoors.

The BBC's Phil Mercer says the smoke in the air is so thick it that breathing it feels like being a heavy smoker.