Delhi’s air high quality turned ‘extreme’ at the same time as dense fog enveloped the nationwide Capital resulting in delays in flight and rail operations.
Winds turned calm in a single day, sending the air high quality plummeting. Delhi’s 24-hour common air high quality Index (AQI) stood at 416 at 9am on Tuesday — up from a studying of 373 at 4pm on Monday.
Visibility in the meantime dipped to 50 metres at each Palam and Safdarjung as over 200 flights had been delayed at Delhi’s Indira Gandhi Worldwide (IGI) airport. A number of trains had been additionally delayed.
On Monday, over 500 flights had been delayed and 14 cancelled as visibility got here all the way down to 150 metres in Delhi. At the very least 30 trains in Delhi had been additionally delayed by half-hour or extra.
India Meteorological Division (IMD) officers mentioned average fog prevailed in Delhi until round 4am, with visibility at 350 metres at Safdarjung and 450 metres at Palam. Nevertheless, it dipped sharply within the subsequent hour and had fallen to 100 metres by 5:30am.
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“As winds remained calm, visibility fell additional and was 50 metres at each Palam and Safdarjung between 7:30am and 8am, earlier than enhancing marginally to 100 and 150 metres respectively at 8:30am,” mentioned the official.
To make certain, the IMD had no color coded alert for Delhi in place. It has forecast shallow to average fog for the capital.
Fog is assessed as shallow when it’s between 500-1000 metres, as ‘average’ when between 200-500 metres and under 200 is ‘dense’ fog. If it dips under 50 metres, then it’s known as ‘very dense’ fog.
IMD knowledge additionally confirmed a number of airports in Northern India noticed zero visibility too. This included Amritsar, Agra, Jaisalmer, Gwalior, Kanpur, Hindon and Bareilly amongst others.
The IMD has forecast dense fog to persist in remoted pockets throughout the northern plains for the following few days, however has mentioned northwesterly winds will strengthen from Wednesday – which is able to scale back total fog depth and unfold.
Nevertheless, dense to very dense fog is once more anticipated by the tip the yr, with a feeble western disturbance anticipated to affect North India between December 28-31.
“We should always see some marginal aid as wind speeds decide up from Wednesday as fog formation is much less when wind speeds are excessive. Nevertheless, a gentle western disturbance is once more approaching round December 28. This may decelerate wind velocity and in addition add moisture, thus creating dense to very dense fog,” mentioned Mahesh Palawat, vice President at Skymet.
Until December 22, Delhi’s month-to-month common AQI stood at 350, whereas it was 295 in the identical interval final yr. Delhi is but to file a single day this month the place the AQI has been under 200 or decrease. As compared, final December noticed eight such days in the identical time final month.
