All but one of the world’s worst polluted cities are in Asia, 83 of which are in one country

According to a new report released by the Swiss air quality technology company IQAir, nearly all of the world’s top 100 most polluted cities are in Asia. The vast majority of these are in India, which was also ranked the world’s third most polluted country, after neighbouring Bangladesh and Pakistan. Four are in China’s Xinjiang Uygur autonomous region.