The report has been prepared on the basis of data collected from 131 countries, and used more than 30,000 ground-based monitors. As per the report, Pakistan, India, and Bangladesh are the top three most polluted countries in the world. Also, Estonia, Australia, Finland, Iceland, Grenada, and New Zealand were among the few other countries that could not match the limit prescribed by the World Health Organization (WHO).
The top places in the list were Lahore in Pakistan, Hotan in China, followed by Rajasthan's Bhiwadi, and then, Delhi at the fourth spot.
Delhi so far has been the world’s most polluted capital, and the report also made a distinction between 'greater' Delhi and New Delhi, the capital. While both are in the top 10, the distinction of the world's most polluted capital goes to Chad's capital N'Djamena.