Panic has gripped the Indian capital, Delhi, as residents woke up to a blanket of thick grey smog on Tuesday. Visibility is poor as pollution levels reached 30 times the World Health Organization’s recommended limit in some areas. The Indian Medical Association (IMA) declared “a state of medical emergency” and urged the government to “make every possible effort to curb this menace”. People have been posting dramatic pictures on social media showing the extent of the problem. Can barely see the tallest buildings in the neighbourhood.