Here are the top five polluted cities in the country

Faridabad, is on top with an Air Quality Index (AQI) of 572

Ghaziabad comes in second with AQI of 568

Delhi, the AQI is at 552

Noida comes in fourth with AQI at 523

Gurgaon, the AQI is at 502. AQI between 0-50 is considered good.

Other major cities in India are quite polluted too-- Kolkata (AQI 196), Mumbai (181) and Lucknow (179)