Over 110 international and domestic flights were delayed while around 25 were cancelled in the last 10 hours as a thick layer of fog blanketed Delhi, as per airport sources.

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The weatherman said that the visibility at Palam dropped to 300 metres at around 11 p.m. on Tuesday, which continued over the night and at 8:30 a.m Wednesday it was 600 metres.

The IMD classifies fog intensity into four types: shallow, moderate, dense and very dense fog.

The visibility ranges from 999 m to 500 m, 499 m to 200 m, 199 m to 50 m and less than 50 m, respectively.

“Latest Satellite pictures at 0700 am of today indicates that fog has reduced over Bihar, east UP, north MP & Delhi since midnight. However, dense fog is still prevailing over parts of Punjab, Haryana, West Uttar Pradesh & northwest Rajasthan and likely to continue few more hours,” IMD said in a tweet at 8:30 a.m.