Three major Indian cities  –  Delhi, Kolkata and Mumbai  – are  in the top 10. Kolkata  is  fourth on the list with  an  AQI  of  196, followed by Mumbai in ninth place with  an  AQI  of  156.  

 A day after Diwali, Delhi  ranked as the  world’s  most polluted  city on Monday,  according to IQAir, a Swiss group that measures  the  air quality levels of 100 major cities based on the concentration of  suspended  particles  in air. air, which is harmful to lung health, is called  PM2.5. 

  According to IQAir, the Indian  national capital recorded an  air quality index  (AQI) of  433,  in the  ‘hazardous’  category, as of 10  am. Lahore, Pakistan ranks  second on the list with  an  AQI  of  384. 

  IQAir’s report said  PM2.5  concentrations  in Delhi  are  currently 79 times  higher than  the  WHO’s  annual air quality guideline  value.  Three major Indian cities  –  Delhi, Kolkata and Mumbai  – are  in the top 10. Kolkata  is  fourth on the list with  an  AQI  of  196, followed by Mumbai in ninth place with  an  AQI  of  156.  

 Mexico City  has been  declared the cleanest city in the world  according to a  live ranking after being  ranked 100th.  

 The AQI displayed by IQAir is based on the  American  legend of  air pollution  criteria.  The rankings  are divided  into 6  groups,  with 0-50 being  “good”  and 301+ being  “dangerous”.  AQI at 51-100 is considered  moderate,  while at 101-150 and 151-200  it is considered “unhealthy  for sensitive  groups”  and  “unhealthy”. At  the other extreme,  an  AQI  of  201  to  300 is  “very unhealthy.”  

  PM10 and PM2.5 levels  spiked  in  some  parts of Delhi on Sunday night as  people burst off  Diwali firecrackers  despite  the ban.  According to  the  government’s  Central Pollution Control Board (CPCB), the  city’s  AQI,  a 24-hour average,  remained  in the  ‘poor’  category. It was recorded  at 283 at  8am on  Monday,  after falling  from  218 at  3pm  on Sunday. These are the best  AQI  Diwali  figures  seen in  Delhi in the last eight years. 

  Last year, the  AQI  was 312  on  Diwali,  while it was 382 in 2021, 414 in 2020, 337 in  2019  and 281 in 2018. The AQI was 342 on Diwali  in 2015, 431 in  2016  and 319 in  year  2017.  

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