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GURUGRAM: The city’s air quality index (AQI) remained in the ‘poor’ category at 223 on Thursday, compared to 248 the previous day. According to experts, air quality could be ‘very poor’ over the weekend as wind speeds could drop to 4 kmph. Paddy burning emissions contributed 7% to PM2.5 in Delhi-NCR, against 4% on Wednesday.
Three of the city’s four air stations — Sector-51 (251), Teri Gram (213) and Goalpahari (232) — recorded ‘poor’ AQI on Thursday. It was ‘moderate’ in Vikas Sadan (194). November has so far seen eight ‘poor’ wind days, six ‘very poor’ days, two ‘severe’ and one ‘moderate’ day.
According to the System of Air Quality and Weather Forecasting and Research (SAFAR), pollutants will accumulate as minimum temperatures drop over the next two days. “Ventilation index is expected to be around 4500 m2/s in Delhi-NCR on Saturday, with AQI expected to become ‘Very Poor’. Air pollution index is less than 6000 m2/s with average wind speed less than 10 kmph, which is unfavorable for dispersion of pollutants,” Subhash Tiwari, a research associate at the Amity Center for Air Pollution Control.
“Pollution hotspots are showing similar and more volatile trends over the years, with some recording higher PM2.5 levels than the entire city,” he added.
Haryana recorded 3,272 farm farms between September 15 and November 17, according to satellite data collected by NASA and collected by the Indian Agricultural Research Institute. Meanwhile, Punjab reported 47,788 farm fires during the same period.
Meanwhile, Delhi’s air quality remained in the ‘poor’ category on Thursday, with an AQI of 260. However, it will start worsening from Friday and could be ‘very bad’ on Saturday. The Air Quality Management Commission will review measures under the Graded Response Action Plan (GRAP) on Friday.
Currently, Phase 2 of GRAP has been implemented across Delhi-NCR. GRAP has classified four different levels of adverse air quality in Delhi, which is reflected through the AQI. Stage 1 is applied when the AQI is ‘poor’ (AQI 201-300), stage 2 when it is ‘very poor’ (AQI 301-400), stage 3 when the air is ‘severe’ (AQI 401-450) and stage 4. When it is ‘Severe+’ (AQI >450).
Actions under Phases 2, 3 and 4 should be invoked at least three days before the AQI reaches the projected level for that phase.
Three of the city’s four air stations — Sector-51 (251), Teri Gram (213) and Goalpahari (232) — recorded ‘poor’ AQI on Thursday. It was ‘moderate’ in Vikas Sadan (194). November has so far seen eight ‘poor’ wind days, six ‘very poor’ days, two ‘severe’ and one ‘moderate’ day.
According to the System of Air Quality and Weather Forecasting and Research (SAFAR), pollutants will accumulate as minimum temperatures drop over the next two days. “Ventilation index is expected to be around 4500 m2/s in Delhi-NCR on Saturday, with AQI expected to become ‘Very Poor’. Air pollution index is less than 6000 m2/s with average wind speed less than 10 kmph, which is unfavorable for dispersion of pollutants,” Subhash Tiwari, a research associate at the Amity Center for Air Pollution Control.
“Pollution hotspots are showing similar and more volatile trends over the years, with some recording higher PM2.5 levels than the entire city,” he added.
Haryana recorded 3,272 farm farms between September 15 and November 17, according to satellite data collected by NASA and collected by the Indian Agricultural Research Institute. Meanwhile, Punjab reported 47,788 farm fires during the same period.
Meanwhile, Delhi’s air quality remained in the ‘poor’ category on Thursday, with an AQI of 260. However, it will start worsening from Friday and could be ‘very bad’ on Saturday. The Air Quality Management Commission will review measures under the Graded Response Action Plan (GRAP) on Friday.
Currently, Phase 2 of GRAP has been implemented across Delhi-NCR. GRAP has classified four different levels of adverse air quality in Delhi, which is reflected through the AQI. Stage 1 is applied when the AQI is ‘poor’ (AQI 201-300), stage 2 when it is ‘very poor’ (AQI 301-400), stage 3 when the air is ‘severe’ (AQI 401-450) and stage 4. When it is ‘Severe+’ (AQI >450).
Actions under Phases 2, 3 and 4 should be invoked at least three days before the AQI reaches the projected level for that phase.
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