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Over 7,000 buses, a majority from neighbouring states, were booked for flouting pollution norms in the national capital in the last six years, the Delhi government informed the state Assembly. A total of 7,219 buses were challaned for not having valid pollution under check (PUC) certificates, from 2012-13 till February 2018, Delhi Transport Minister Kailash Gahlot said during the ongoing session of the Assembly.