Photos: A track of Delhi air quality’s downward slide this week

The national capital's air quality index (AQI) shot from 301 on Wednesday to 340 on Thursday. While winds brought minor relief last week with the AQI hanging in “poor” category, this week Delhi saw it dipping to “severe” over the past three days. The Centre-run System of Air Quality and Weather Forecasting (SAFAR) has advised people to reduce outdoor activities in the early morning and after sunset. A look at the air quality comparison in Delhi on November 20th and 21st in pictures.

UPDATED ON NOV 22, 2019 04:47 PM IST 8 Photos
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A view of the India Gate, on Wednesday, November 20. Air quality in the national capital entered the very poor category on Wednesday. Due to prevailing calm winds and increased incidents of farm fires the AQI was likely to turn severe over the next two days. (Sanchit Khanna / HT Photo)

A view of the India Gate, on Wednesday, November 20. Air quality in the national capital entered the very poor category on Wednesday. Due to prevailing calm winds and increased incidents of farm fires the AQI was likely to turn severe over the next two days. (Sanchit Khanna / HT Photo)

UPDATED ON NOV 22, 2019 04:47 PM IST
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A view of the India Gate engulfed in smog, on Thursday, November 21. As predicted by Central Pollution Control Board (CPCB) the overall air quality of Delhi on Thursday slipped into the higher end of the ‘very poor’ category and deteriorated further due to the extremely low wind speeds. (Sanchit Khanna / HT Photo)

A view of the India Gate engulfed in smog, on Thursday, November 21. As predicted by Central Pollution Control Board (CPCB) the overall air quality of Delhi on Thursday slipped into the higher end of the ‘very poor’ category and deteriorated further due to the extremely low wind speeds. (Sanchit Khanna / HT Photo)

UPDATED ON NOV 22, 2019 04:47 PM IST
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An AQI between 201 and 300 is considered “poor”, meanwhile 301-400 form the “very poor” and 401-500 mark “severe” categories. (Yogendra Kumar / HT Photo)

An AQI between 201 and 300 is considered “poor”, meanwhile 301-400 form the “very poor” and 401-500 mark “severe” categories. (Yogendra Kumar / HT Photo)

UPDATED ON NOV 22, 2019 04:47 PM IST
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A view of the Humayun’s Tomb, on Wednesday, November 20. The air quality index (AQI) was 301 on Wednesday, according to the CPCB. (Sanchit Khanna / HT Photo)

A view of the Humayun’s Tomb, on Wednesday, November 20. The air quality index (AQI) was 301 on Wednesday, according to the CPCB. (Sanchit Khanna / HT Photo)

UPDATED ON NOV 22, 2019 04:47 PM IST
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A view of the Humayun’s Tomb, on Thursday, November 21. According to the Centre-run System of Air Quality and Weather Forecasting (SAFAR), the overall AQI on Thursday was recorded at 340 in the capital. (Sanchit Khanna / HT Photo)

A view of the Humayun’s Tomb, on Thursday, November 21. According to the Centre-run System of Air Quality and Weather Forecasting (SAFAR), the overall AQI on Thursday was recorded at 340 in the capital. (Sanchit Khanna / HT Photo)

UPDATED ON NOV 22, 2019 04:47 PM IST
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A student helps another with an anti pollution facemask on their way to school, at Laxmi Nagar, on Thursday. SAFAR advised sensitive people to avoid all physical activity outdoors. It also advised people with asthmatic ailments to keep relief medicine handy. For the general public, it advised stopping outdoor activity in the early morning and after sunset. (Raj K Raj / HT Photo)

A student helps another with an anti pollution facemask on their way to school, at Laxmi Nagar, on Thursday. SAFAR advised sensitive people to avoid all physical activity outdoors. It also advised people with asthmatic ailments to keep relief medicine handy. For the general public, it advised stopping outdoor activity in the early morning and after sunset. (Raj K Raj / HT Photo)

UPDATED ON NOV 22, 2019 04:47 PM IST
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A view of the Rashtrapati Bhawan, on Wednesday, November 20. The conditions are likely to improve by November 23 afternoon since a strengthening of surface winds has been forecast owing to the passing of Western disturbance. (Sanchit Khanna / HT Photo)

A view of the Rashtrapati Bhawan, on Wednesday, November 20. The conditions are likely to improve by November 23 afternoon since a strengthening of surface winds has been forecast owing to the passing of Western disturbance. (Sanchit Khanna / HT Photo)

UPDATED ON NOV 22, 2019 04:47 PM IST
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A view of smog and pollution at Rashtrapati Bhawan on Thursday, November 21. The dip in AQI is mainly due to two factors -- calm surface winds that prevent dispersion of pollutants and the stubble fire count that increased significantly as compared to last week. The smoke from stubble burning accounted for 7% of Delhi’s pollution on Thursday and is likely to decrease in the coming days. (Sanchit Khanna / HT Photo)

A view of smog and pollution at Rashtrapati Bhawan on Thursday, November 21. The dip in AQI is mainly due to two factors -- calm surface winds that prevent dispersion of pollutants and the stubble fire count that increased significantly as compared to last week. The smoke from stubble burning accounted for 7% of Delhi’s pollution on Thursday and is likely to decrease in the coming days. (Sanchit Khanna / HT Photo)

UPDATED ON NOV 22, 2019 04:47 PM IST

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