Delhi choked by dangerous smog

Crop burning in nearby areas added to Delhi's ongoing high pollution levels have left the Indian capital under a blanket of thick smog.

Particulate levels are about 20 times higher than the maximum recommended by the World Health Organisation.

Millions of masks are being distributed to schools and to high-risk people around the capital amid a declared public health emergency.

The city's schools have also been closed until at least next Tuesday.