Calm winds continued to negatively impression the dispersion of pollution preserving Delhi’s air high quality within the larger finish of the “very poor” class for a fifth straight day even because the minimal temperature was 4 notches above regular at 18°C.
The minimal temperature has risen after touching the season’s low of 16.5°C on November 3. It was 17.2°C on Wednesday and 17.6°C a day earlier. The utmost temperature was anticipated to hover round 33°C on Thursday in comparison with 32.3°C a day earlier.
No less than 9 stations recorded “extreme” air high quality at 9am on Thursday. Anand Vihar recorded a mean Air High quality Index (AQI) of 427, adopted by Wazirpur (424). A median AQI of 367 was total recorded. This marked a marginal improve from Wednesday’s 4pm studying of 352.
AQI has been on the larger finish of “very poor”—over 350—since November 3 when Delhi recorded its highest of the season at 382. It has been over 300 and within the “very poor class” since October 30. The air high quality has not deteriorated to the “extreme” zone up to now regardless of unfavourable meteorological situations. Delhi has beforehand recorded at the least one “extreme” air day by November 5 as per CPCB knowledge obtainable since 2015.
The Central Air pollution Management Board classifies an AQI of 0-50 as “good”, between 51 and 100 as “passable”, between 101 and 200 as “average”, between 201 and 300 as “poor”, between 301 and 400 as “very poor”, and over 400 as “extreme”.
The wind situations have been anticipated to be unfavourable for the dispersion of pollution till the weekend. The air high quality was more likely to stay “very poor” till Saturday.
A minimal visibility of 1,200 metres was recorded at Palam at 6:30am on Thursday. The visibility dipped to 800 metres throughout town on Wednesday. Visibility beneath 1,000 metres is classed as fog.
The wind path continued to oscillate between southeasterly and westerly. The contribution of stubble burning to Delhi’s PM 2.5—predominantly via northwesterly to westerly winds— was 20.3% on Tuesday, knowledge from the Determination Assist System calculated primarily based on the precise fireplace counts confirmed. It was 23.3% a day earlier. On November 1, farm fires have been estimated to have contributed a season-high of 35.1% of Delhi’s PM 2.5 load.
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