Health Desk: Nov 8, 2017 -- Delhi on Wednesday shut all primary schools as pollution hit 70 times the World Health Organization's safe level, prompting doctors in the Indian capital to warn of a public health emergency.
Dense grey smog shrouded the roads of the world's most polluted capital, where many pedestrians and bikers wore masks or covered their mouths with handkerchiefs and scarves.
The US embassy website showed the concentration of PM 2.5 -- the microscopic particles that are the most damaging to health -- topped 700 early on Wednesday morning, 70 times the WHO guidelines on long-term exposure, before dropping slightly.
"When I came to Delhi in 1984, the air in the city was clean. But today when I left at 4 am for work I could barely see anything," said Jeevanand Joshi, a roadside tea seller.
The Indian Medical Association declared a public health emergency, urging administrators to "curb this menace", while the Environment Pollution Authority warned that things were set to get worse in the coming days.
"We have decided to shut schools up to primary level for a day, and will evaluate the situation on an hourly basis to see if such a closure needs to be extended," Delhi's deputy chief minister Manish Sisodia told reporters.
Since 2014, when WHO figures showed the extent of the crisis, authorities in Delhi have closed power plants temporarily and experimented with taking some cars off the road.
According to government data from 2015, about 2 million students are enrolled in primary schools in Delhi.