Guardian reports scrive this the world’s worst air quality proclaims Delhi as the most polluted city in the world overwhelming majority of cities in Africa the world’s worst air quality overwhelming majority of cities in Africa World Health Organization’s The Guardian kills 3.3 million people every year Guardian 80 percent Guardian the most polluted city in the world terrible air quality three million people worldwide each year in urban areas title in the world the world’s worst air quality most polluted proclaims Delhi as the most polluted city in the world this Karl Mathiesen the world’s worst air quality proclaims Delhi as the most polluted city in the world según datos the Guardian Guardian overwhelming majority of cities in Africa the most polluted city in the world most polluted The Guardian Guardian World Health Organization’s