Air pollution choking New Delhi has ground outdoor work to a halt and disrupted air travel in the Indian capital.

A sharp spike in Delhi's air pollution was witnessed in the past 24 hours with 30 out of 36 monitoring stations reporting a severe air quality index.

Visibility fell sharply in Delhi this week as a toxic mixture of smoke and fog shrouded the Indian capital even before winter sets in. Here is a look at the problem, and what triggered it. HOW BAD WAS THE SMOG?

As the Capital grapples under deteriorating air quality, the Graded Response Action Plan (GRAP) Stage III has been imposed by the Commission for Air Quality Management in NCR and Adjoining Areas (CAQM).

Delhi residents woke up to ‘severe’ air quality on Thursday morning (November 14), a day after the national capital recorded the worst AQI in the country, with dense fog blanketing the NCR, reducing visibility.

Dense smog engulfed Delhi and its surrounding areas on Wednesday morning with visibility dropping and the air quality settling in the "very poor" category. According to data by the Central Pollution Control Board,