India, Nov. 1 -- New DelhiA day after widespread rainfall was witnessed in Delhi, residents woke up to season's first fog on Saturday morning, with visibility dropping sharply at Safdarjung and Palam airports.

At 6.30am, visibility at Safdarjung was recorded at 500 metres, against 4,000 metres at the same time on Friday. At Palam, it was recorded at 800 metres, down from 4,000 metres a day earlier, according to India Meteorological Department (IMD) data.

As per IMD standards, a fog is considered "shallow" when visibility ranges from 500 metres to 1,000 metres

The air quality on Saturday also deteriorated to the "moderate" category. The 24-hour average air quality index (AQI) was recorded at 117 (moderate) on Saturday, as compared to 60...