It's not yet time for fog muffler

Maneesh Pandey / TNN / Dec 4, 2005, 02:36 IST

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What we are facing in early morning hours is mist. Fog must not be confused with mist, which forms when relative humidity is more than 95%.

NEW DELHI: Winter chill has set in with temperatures plummeting well below five degrees celsius, but there's still few more days to go before the Capital wakes up under a blanket of fog.
Said M Duraiswamy of the met department: "As per data received till Saturday evening, Delhi will not be affected by any fog formation for two to three days. What we are facing in the early morning hours is mist."
"Three conditions �� moisture, outgoing radiation and clear sky �� create the formation of fog over north and north-western India during winter...So far, no such weather formation has come to notice, hence little chance of fog in the next few days," he added.
Duraiswamy said fog must not be confused with mist, which forms when relative humidity is more than 95% and visibility drops to 1,000-2,000 metres.

"Mist is only for few hours in the morning and clears after sunrise unlike fog that continues till noon and again starts setting in after sunset," he explained.
S C Garg of National Physics Laboratory (NPL), which had earlier conducted a study on the correlation between fog and pullution, hinted that fog cover this time won't be as dense or last as long as it used to some years back.
"This is due to decrease in pollution levels after the introduction of CNG in public transport," he said. "It is pollution which first inhibits fog formation, but later when the fog gets formed, it is the same pollution which allows it to last longer in a dense form.
That was the case three to four years back when fog in Delhi used to occur late compared to neighbouring areas (about 50 to 100 km from Delhi) in Haryana, eastern Rajasthan and western Uttar Pradesh," Garg added.

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