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“New Delhi is ghastly right now. So much so that the government in the national capital has shut down 1,800 schools for the first time ever, forcing a million students to stay at home to avoid breathing in the deadly smog that continues to shroud the city. This comes a week after firecracker residue from the Diwali festivities pushed the city’s Air Quality Index (AQI) into the red zone.

Levels of particulate matter (PM) 10 and PM2.5 hit 844 µg/m3 and 588 µg/m3 respectively on Nov. 06, according to data from the System of Air Quality and Weather Forecasting and Research (SAFAR), which monitors air quality. That’s shockingly above the safe limits of 100 µg/m3 and 60 µg/m3 respectively, and suggests that things have only worsened since last week when the “severe” pollution advisory was issued.

“Pollution has increased to an extent that (the) outdoors in Delhi are resembling a gas chamber,” chief minister Arvind Kejriwal said on Nov. 06. Residents have taken note, lining up in the hundreds to buy masks. On Nov. 06, many even gathered at Jantar Mantar to protest, calling on the government to declare the situation a national emergency.

The road to hell

Delhi ranks among the world’s most polluted cities, thanks in part to its enormous population of around 25 million and the over 8.8 million vehicles that ply on its roads every day (an estimate from March 2015). And now, choked by a deadly cloud of smoke, visibility has reduced to just 200 metres. The city has witnessed several road accidents due to this over the past few days.

Over the past few weeks, the crisis has been complicated by a peculiar annual agricultural practice in neighbouring states. “Fireworks during Diwali marginally added to the pollution… But other things inside Delhi did not drastically change. So the smog is mainly due to smoke from farm fires,” Kejriwal said.

Every year around this time, farmers in Punjab and Haryana—the predominantly agricultural states to the west and northwest of Delhi—burn the leftover straw in their rice and wheat fields. This is the cheapest way to prepare the land for the next season of sowing. However, winds blowing from these states carry the smoke from these vast farmlands to Delhi, adding to the national capital’s already high PM levels.

Now, with no winds blowing over Delhi, the stagnant particulate matter is smothering the city. And the result is a crisis that is the worst in 17 years, the culmination of Delhi’s decades-long struggle against pollution.

Making (foggy) history

At the time of India’s independence in 1947, fog in Delhi was rather rare. In fact, in 1951, only one foggy day was reported between the winter months of December and February. By 1996, there were 46 days and, by 2013, there were 74.

Things worsened in the early 1990s with rapid urbanisation and growing vehicular traffic—particularly of those with diesel engines. Suspended PM hit a high of 409 µg/m3 in 1995.

Three years later, India’s supreme court urged the Delhi government to act, forcing buses and three-wheelers to switch to compressed natural gas (CNG), a more environment-friendly option. The results were clear. By 2000, PM levels dropped to 190 µg/m3 and continued to fall for several years, reaching 161 µg/m3 in 2007.

This phase, however, did not last. With the number of vehicles rising relentlessly, PM levels jumped once again by 2008.

“The problem is that while emission norms were made more stringent and pollution levels dipped, the increase in vehicles skewed the matter,” A B Akolkar, a member of India’s Central Pollution Control Board, told the Indian Express newspaper last year. And that set the stage for Delhi’s current crisis.” Quartz India. Read it on

Delhi’s air is so toxic that schools are closing, expats are fleeing, and the visiting UK PM could lose hours from her life