GRAP stage 3 will come into force at 8am on Friday. The Delhi government announced that classes for primary schools will be shifted to online.

Northern India encountered the recurring annual pre-winter event of air emergency where the Air Quality Index (AQI) readings of main pollutant PM 2.5 breached the 400-mark of “very poor” and landed the air of Delhi, Punjab and other northern cities into the “hazardous” category.

Every year, Delhi and northern states battle hazardous air during the winter months of October to January due to plummeting temperatures, smoke, dust, low wind speed, vehicular emissions and crop stubble burning. This time, experts say that the condition is likely to get worse in the coming days.

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

Air pollution in India's national capital increased to 'severe' on an official index on Wednesday for the first time this season as temperatures and wind speeds dropped, reducing visibility and affecting some flights.

On Wednesday, the national capital's air quality took a serious turn for the worse, with the Air Quality Index (AQI) skyrocketing to a staggering 418. This alarming number puts the capital squarely in the 'severe' category,

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Delhi surpassed Lahore as the world's most polluted city, with its air quality index reaching a 'severe' 418. The smog, a mix of fog and smoke, reduced visibility, causing flight diversions. Low wind speed,

Delhi overtook Pakistan ’s Lahore as the world’s most polluted city in Swiss group IQAir’s live rankings, with an air quality index (AQI) score of more than 1,000, which is considered “hazardous”, but India ’s pollution authority said the AQI was around 350.