A cold wave prevailed in the Capital for the second consecutive day on Friday with the air quality plummeting from Thursday’s 265 units to 272 units. While the air quality is still in ‘poor’ category, it is close to reaching ‘very poor’ (300 units).While scientists at the Central Pollution Control Board (CPCB) said the air quality will fluctuate between ‘poor and moderate’, a further drop in temperature is likely over the coming fortnight.The maximum temperature on Friday was recorded at 19.5 degrees Celsius, a few notches above yesterday’s 19.1 degrees Celsius, the lowest maximum the season has witnessed.”There will be shallow to dense fog with slight drop in temperature. Winds from the northern region are bringing the cold wave. The air quality may improve with more winds,” said a CPCB official.The AQI units are measured against PM 2.5 — the most prominent pollutant in Delhi-NCR.After a brief respite on December 6 and 7, which were tagged as “good air days” in the month, pollution levels spiked again on Friday, with the AQI shooting up to 390 units. The permissible standards for PM 2.5 — the most prominent pollutant in the city — are 60 units.
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