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Air quality in Delhi continues to remain 'Poor', may turn 'Very Poor' by tomorrow

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New Delhi, Oct 20: SAFAR on Tuesday said that pollution levels dipped slightly in the national capital this morning due to favourable wind speed, though the air quality was still in the "poor" category.

Air Pollution

The Ministry of Earth Sciences' air quality monitor, SAFAR, said the air quality index (AQI) was likely to slip to the "very poor" category by Wednesday due to a change in the wind direction and a reduction in the wind speed.

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Delhi recorded an air quality index (AQI) of 227 at 9 am on Tuesday. The 24-hour average AQI was 244 on Monday. It was 254 on Sunday and 287 on Saturday.

An AQI between 0 and 50 is considered 'good', 51 and 100 'satisfactory', 101 and 200 'moderate', 201 and 300 'poor', 301 and 400 'very poor', and 401 and 500 'severe'.

Calm winds and low temperatures allow the accumulation of pollutants, while high wind speed helps in their dispersion.

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Expecting further deterioration in the air quality in the coming days, the Supreme Court-mandated Environment Pollution (Prevention and Control) Authority (EPCA) on Monday asked Uttar Pradesh and Haryana governments to be ready to close thermal power plants that do not meet the standards laid down in 2015.

Meanwhile, EPCA chief Bhure Lal asked the two state governments to review the preparedness for closing thermal power plants and to inform the pollution watchdog about it, as well as the steps that will be taken to ensure compliance with the necessary shutdown during the peak winter period.

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    SAFAR said a change in surface wind direction is expected by early Wednesday which is "likely to bring calm surface wind conditions, leading to low ventilation and deterioration of AQI".

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