The Municipal corporation of Hyderabad (MCH), which paints the city green with hoardings calling for a "clean and green city", is the main culprit among government departments when it comes to atmospheric pollution caused by exhausts from vehicles. In all, 63 per cent of the 1061 petrol-driven and only 26 per cent of the 1274 diesel-driven vehicles cleared the pollution control test conducted on 2335 government vehicles since Sunday.