The most polluted country was Chad, which had an annual PM2.5 concentration ... with six of the world’s nine most polluted cities. The country’s capital, Delhi, remained the world’s most ...

The IQAir World Air Quality Report, which analysed data from over 40,000 air quality monitoring stations across 8,954 locations in 138 countries, found that only 17 per cent of cities met the World ...

The only city outside of Asia featured on the list is N’Djamena, the capital of Chad in central Africa – which was named the country with the worst air pollution. Meanwhile the cities with the ...