New Delhi: As the air quality in the national capital continues to deteriorate, the visibility will remain poor for the next three days due to fog and smog, said Senior Scientist of the Indian Meteorological Department (IMD).  However, it’s not only Delhi but two metro cities in India have recorded poor levels of air pollution according to IQAir, a Switzerland-based climate group.


The climate group is also a technology partner of the United Nations Environmental Program(UNEP) has listed Mumbai and Kolkata are in the top 10 most polluted cities of the world.


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Delhi remains at the top with an AQI of 460 as listed by the IQAir service, Kolkata comes sixth and Mumbai is ranked fourth in the entire list.  The other cities in the world recording the worst AQI indices include Lahore, in Pakistan, and Chengdu, in China.


Check top 10 cities with the worst air quality indicators and pollution rankings, according to IQAir:


    City            Country     AQI


1. Delhi,         India,         460


2. Lahore,      Pakistan,  328


3. Chengdu,  China,   176


4. Mumbai,   India,     169


5. Karachi,    Pakistan, 165


6. Kolkata,    India,       165


7. Sofia,        Bulgaria,     164


8. Dhaka,      Bangladesh, 160


9. Belgrade,  Serbia,       159


10. Jakarta,   Indonesia,  158


The System of Air Quality and Weather Forecasting And Research (SAFAR) under the Ministry of Earth Science also reported that the air quality is in the 'very poor' category in Delhi with an air quality index (AQI) of 390.


Going by the analysis of the Delhi Pollution Control Committee, people in Delhi breathe the worst air between November 1 and November 15 every year. The city has recorded severe air quality on six of the last eight days after Diwali.