Winds change: Air qual­ity set to worsen

City To Feel Ef­fects Of Farm Fires From Next Week

The Times of India (New Delhi edition) - - Times City - TIMES NEWS NET­WORK

New Delhi: Delhi’s wind di­rec­tion has shifted to blow from the north-west and the ef­fects from the trans­port of par­tic­u­late mat­ter due to stub­ble burn­ing in north In­dia could be seen in the cap­i­tal soon. Delhi’s air qual­ity had de­te­ri­o­rated to the ‘mod­er­ate’ cat­e­gory on Thurs­day evening with an AQI read­ing of 141. How­ever, a strong spell of show­ers brought the air qual­ity tem­po­rar­ily un­der con­trol with a read­ing of 100 (sat­is­fac­tory) recorded on Fri­day.

SA­FAR, a fore­cast body un­der the Union min­istry of earth sci­ences, says that grad­ual de­te­ri­o­ra­tion of air qual­ity is ex­pected in the next two to three days but the in­dex should re­main in the ‘mod­er­ate’ cat­e­gory.

“Thun­der­show­ers ob­served over Delhi and sur­round­ing re­gions have led to a washout of pol­lu­tants and a mar­ginal im­prove­ment of the air qual­ity. The pre­dom­i­nant wind di­rec­tion has changed from east­erly to west­erly. This will lead to the trans­port of rel­a­tively dusty air to the re­gion. Mar­ginal de­te­ri­o­ra­tion of air qual­ity, but in the same mod­er­ate cat­e­gory, is pre­dicted for Satur­day,” said SA­FAR.

The long-term model of the body, how­ever, says the ef­fects of stub­ble burn­ing are ex­pected next week with mod­els in­di­cat­ing the de­vel­op­ment of a weak an­ti­cy­clone around Oc­to­ber 6. “Though the wind di­rec­tion (north-west­erly), un­der the in­flu­ence of the ap­proach­ing western dis­tur­bance, is go­ing to be­come fa­vor­able for the biomass plume trans­port, good wind speed will lead to ef­fi­cient ven­ti­la­tion of the pol­lu­tants. A dras­tic de­te­ri­o­ra­tion is ex­pected only in the mid­dle of the sec­ond week of Oc­to­ber as per SA­FAR model sen­si­tiv

fore­cast ➤ Di­rec­tion of the wind has changed and it is now blow­ing from the north­west. This means ef­fects of stub­ble burn­ing in north In­dia could soon be seen in Delhi Delhi’s AQI on Fri­day

➤ While

Delhi’s AQI had de­te­ri­o­rated to ‘mod­er­ate’ on

Thurs­day, sud­den show­ers on Fri­day tem­po­rar­ily

Oct 3

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Sept 30

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AQI THIS WEEK ity anal­y­sis,” said SA­FAR.

Met of­fi­cials say the ef­fects of a re­treat­ing mon­soon are also be­ing seen in the re­gion, which could lead to de­te­ri­o­ra­tion in air qual­ity soon. “North-west­erly winds gen­er­ally bring par­tic­u­late mat­ter to Delhi. The im­pact could be more next week when wind speed re­duces,” said a Met of­fi­cial.

Delhi’s max­i­mum tem­per­a­ture was 31.4 de­grees Cel­sius on Fri­day — three de­grees below nor­mal for this time of the sea­son. Saf­dar­jung, the base sta­tion in the cap­i­tal, re­ceived 47.3mm of rain­fall till 8.30am on Fri­day.

The re­gional me­te­o­ro­log­i­cal depart­ment has fore­cast a spell of very light rain for Satur­day with the max­i­mum and min­i­mum tem­per­a­tures likely to be 33 and 21 de­grees Cel­sius re­spec­tively.

helped in con­trol­ling AQI

➤ Fore­cast body SA­FAR says air qual­ity may de­te­ri­o­rate marginally in the next two days. How­ever, AQI is ex­pected to stay in the ‘mod­er­ate’ zone

➤ Wind speed may slow down by next week, lead­ing to ac­cu­mu­la­tion of pol­lu­tants

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