Mon­soon leaves city with 38% rain deficit

Over-A-Week De­lay For Just 3rd Time In 9 Yrs

The Times of India (New Delhi edition) - - Times City - Jas­jeev.Gand­hiok @times­group.com

New Delhi: The mon­soon of­fi­cially re­treated from the cap­i­tal on Thurs­day — 10 days later than “nor­mal”. Delhi recorded an over­all rain deficit of 38%, data from the me­te­or­log­i­cal de­part­ment showed. This is also only the third time since 2010 that the mon­soon re­treat has been de­layed be­yond September 30.

In both 2018 and 2017, the mon­soon of­fi­cially started re­treat­ing from Delhi on September 30, whereas it was de­layed by over a week in 2016 (October 7). The de­lay was the long­est in 2013, when the re­treat was de­clared on October 17.

Delhi recorded 404.1mm of rain­fall this sea­son — well beMon­soon

re­treat in Delhi on Usual date for re­treat low the nor­mal of 648.9mm. “There has been an over­all rain deficit of over 200mm this mon­soon sea­son. This makes it a deficit of 38% and, de­spite a pro­longed mon­soon, not much re­cov­ery hap­pened in September,” an of­fi­cial said. In fact, Delhi recorded a rain deficit in all four months of June, July, Au­gust and September. The mon­soon reached Delhi a week late this year (July 5) against the nor­mal date of June 29, mean­ing there was an 83% rain deficit that month alone. Only 11.2mm of rain­fall was recorded against a nor­mal of 65.5mm.

In July, 210.4mm was re­ceived com­pared with a nor­mal of 276.1mm (24% deficit) and, in Au­gust, 119.6mm was recorded against an ex­pected 247.4mm (52% deficit). In September, Delhi re­ceived 74.1mm of rain­fall as com­pared with a nor­mal of 125.1mm (41% deficit).

Kuldeep Sri­vas­tava, sci­en­tist at IMD, said fol­low­ing the re­treat, north­west­erly winds were af­fect­ing Delhi now, with stub­ble burn­ing likely to play a part in the air qual­ity. An anti-cy­clonic for­ma­tion over Ra­jasthan may also in­flu­ence Delhi in the com­ing days.

Delhi’s max­i­mum tem­per­a­ture on Thurs­day was recorded at 33.9 de­grees Cel­sius, while the min­i­mum was 20.7 de­grees Cel­sius. Hu­mid­ity lev­els os­cil­lated be­tween %36 and 93% in the last 24 hours. The re­gional me­te­o­ro­log­i­cal de­part­ment has fore­cast “hazy” con­di­tions in the morn­ing for the next few days with the max­i­mum and min­i­mum tem­per­a­tures likely to hover around 34° and 21° C, re­spec­tively.

Since 2010, this is the sec­ond

most de­layed re­treat af­ter 2013

2018

2017

2016

2015

2014

2013

2012

2011

2010

Sept 30

Sept 30

Oct 8

Sept 29

Sept 28

Oct 17

Sept 25

Sept 26

Sept 29

1Delhi

The dip in air qual­ity is due to a change in wind di­rec­tion to north­west­erly, in­flu­ence of stub­ble burn­ing and lo­cal emis­sions get­ting trapped af­ter ef­figy burn­ing. Wind speeds also low

CPCB wrote to state pol­lu­tion con­trol boards and other gov­ern­ment agen­cies on Thurs­day, ask­ing them to take ap­pro­pri­ate mea­sures to con­trol dust and pol­lu­tion.

In letters sent to the mu­nic­i­pal bod­ies in Delhi and NCR states as well as other agen­cies, CPCB asked for weekly ac­tion taken re­ports to be sub­mit­ted and called for pre­cau­tions to be taken dur­ing con­struc­tion ac­tiv­i­ties, par­tic­u­larly with dust, C&D waste and open burn­ing.

Among the agen­cies con­tacted by CPCB were NHAI, DMRC, CPWD, NBCCIL, PWD, DDA, DSIIDCL New Delhi, Ghazi­abad De­vel­op­ment Au­thor­ity, Noida and Greater Noida au­thor­i­ties.

A SAFAR bul­letin said, “The south­west mon­soon has started to re­treat now. Wind speeds con­tinue to be slow and vari­able with pre­dom­i­nant di­rec­tion from the west. Un­der these con­di­tions, air qual­ity is

pre­dicted to de­te­ri­o­rate fur­ther. In­di­ca­tions of in­creased fire ac­tiv­ity dur­ing the last 48 hours are vis­i­ble from satel­lite im­agery and a fur­ther de­te­ri­o­ra­tion of AQI is ex­pected for the next two days.”

AQI is clas­si­fied as “poor” at read­ing be­tween 201 and 300. It is be­low the “very poor” (301-400) and “se­vere” (401-500) zones while be­ing worse than “mod­er­ate” (101200), “sat­is­fac­tory” (51-100) and “good” (be­low 50) lev­els.

The last time Delhi had air qual­ity in the “poor” zone was on July 14, when it touched an AQI of 235. Fol­low­ing that, a pro­longed mon­soon largely helped Delhi keep the AQI be­low 200. In fact, Delhi recorded two “good” air days in Au­gust while ex­pe­ri­enc­ing the clean­est September in the last nine years, ac­cord­ing to CPCB data. SAFAR, how­ever, said a late with­drawal of the mon­soon was bad for Delhi’s air qual­ity.

“The late mon­soon with­drawal is not good for air qual­ity in north In­dia. Dur­ing the third to fourth week of October, the tem­per­a­ture will also start to cool. The an­ti­cy­clone, which per­sists as part of the with­drawal, as­so­ci­ated with clear skies and sink­ing mo­tion will mean sig­nif­i­cantly calm sur­face winds. Both these con­di­tions will lead to stag­nant weather con­di­tions (low wind speeds and de­scend­ing air), which favours rapid fine par­tic­u­late mat­ter for­ma­tion and ac­cu­mu­la­tion of pol­lu­tants,” said SAFAR.

On Wedne­day, EPCA chair­man Bhure Lal also wrote to NCR states, ask­ing them to pre­pare for “very poor” and “se­vere” air un­der the GRAP from October 15. Air qual­ity was likely to de­te­ri­o­rate from October 12 on­wards, he said.

“EPCA has been ad­vised by the task force on GRAP, which is chaired by the mem­ber sec­re­tary of the CPCB that the com­ing pe­riod, be­gin­ning October 12, 2019, is pro­jected to have ad­verse weather con­di­tions, which ex­ac­er­bate the po­ten­tial for pol­lu­tion,” said Lal.

Oct 10

Sept 30

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