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.
The levels of tiny particulate matter (known as PM 2.5) that enter deep into the lungs reached as high as 700 micrograms per cubic metre in some areas on Tuesday, data from the System of Air Quality Weather Forecasting and Research website shows.
more
Delhi residents panic as 'deadly smog' returns - BBC News
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.
The levels of tiny particulate matter (known as PM 2.5) that enter deep into the lungs reached as high as 700 micrograms per cubic metre in some areas on Tuesday, data from the System of Air Quality Weather Forecasting and Research website shows.
more
Delhi residents panic as 'deadly smog' returns - BBC News
