A study titled “Triple dip La-Nina, unorthodox circulation and unusual spin in air quality of India” was conducted | Current Affairs | Vision IAS
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  • The study was conducted by National Institute of Advanced Studies and Indian Institute of Tropical Meteorology.

 

  • Key-highlights
    • Indian regions encountered a mysterious trend reversal in pollution ( PM2.5) during the winter of 2022–23. 
    • The unusually worst air quality over South-Western India, whereas relatively cleaner air over the highly polluted North India was observed.
    • Factors Responsible: 
      • Winter in 2022 coincided with the last phase of an unusual triple-dip (or three consecutive years) La Nina event.
      • The change in the normal wind direction: During normal time, the wind blows in the north-westerly direction (from Punjab towards and Gangetic plains) which is responsible for stubble burning pollutants to flow in Delhi.
      • However, in the winter of 2022 the wind circulation was in the north-south direction. Air pollutants being carried from Punjab and Haryana bypassed Delhi (lesser pollution) and surrounding areas and flew over western and  southern regions.

 

  • La-Nina refers to the periodic cooling of ocean surface temperatures in the central and east-central equatorial Pacific.
    • Typically, occurs every 3 to 5 years or so. 
    • It positively impacts the Indian Monsoon. 
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