Delhi overtakes Lahore as world's most polluted major city as air quality deteriorates
<p>India’s capital, Delhi, overtook Lahore to become the world’s most polluted city on Friday, with air quality reaching hazardous levels and visibility dropping as smog blanketed the city of 20 million people.</p> <p>Earlier, Delhi’s air quality index (AQI) stood at 334, categorised as “hazardous”, making it the most polluted major city globally, according