Choking smog and pollution is still at emergency levels - but thousands of schools have reopened in Delhi today.

That has angered many parents in the world's most polluted capital city.

"On one hand the government is saying there is a health emergency and on the other they are playing with children's health. Why open the schools now?" said Ashok Agrawal, president of the All India Parents Association.

"It is so disturbing to see children coughing and struggling to breathe all the way to the school."

30,000 schools in Delhi and Punjab were closed for three days last week after doctors declared a public health emergency because of the smog caused by farmers burning crop stubble.

The India smog crisis has turned the spotlight on to air pollution and the risk to children.