According to the 2023 World Air Quality Report by IQAir, Begusarai ranks at the top of the list of the most polluted cities in the world, with an average annual PM2.5 concentration of 118.9
Guwahati was identified as the second most polluted city in the world with an average annual PM2.5 concentration of 105.4
Delhi was in the third position on the list of the most polluted cities globally, with an average annual PM2.5 concentration of 102.1
Mullanpur was in the fourth place on the list of the most polluted cities globally, with an average annual PM2.5 concentration of 100.4
Pakistan's Lahore stood fifth in the list of the most polluted cities globally, with an average annual PM2.5 concentration of 99.5
New Delhi is the sixth most polluted city in the world with an average annual PM2.5 concentration of 92.7
Siwan grabbed seventh spot in the list of most pollued cities in the world with an average annual PM 2.5 concentration of 90.6
According to the list, Saharsa is at the eighth spot with an average annual PM 2.5 concentration of 89.4
Goshaingaon held the ninth spot in the list of most polluted cities in the world with an average annual PM 2.5 concentration of 89.3
Bihar's Katihar is at the tenth spot in the list of most polluted cities in the world with an average annual PM 2.5 concentration of 88.8