दिवाली की पूर्व संध्या पर दिल्ली दुनिया का सबसे प्रदूषित बड़ा शहर: स्विस समूह IQAir

New Delhi: Delhi was the world's most-polluted major city on Saturday, a day before Diwali, according to Swiss group IQAir’s live ranking. According to IQAir, Delhi was ranked first among the world’s major cities at 10.35 am, with a US air