Imagine if one invention could convert automobiles from polluters into air purification devices. Our Pariyayantra Air Filtration System purifies air as a vehicle moves, without consuming any power. A pilot project sponsored by the Government of India is currently in progress and the results are highly encouraging. Our system does not consume any electricity like other air purifiers, and is mounted on the roof of the vehicle. When mounted on buses, it works the same as six indoor air purifiers. It occupies little space on the bus rooftop, with a weight of 18 kilograms, and does not add any extra load on the vehicle engine even while running. The device is designed to match the aesthetics of the vehicle, and any moving vehicle fitted with it will become an air purifier too. The filters are biodegradable and have already been installed in 30 buses, collecting 1.5 kilograms of dust in just 10 days, with 77 percent of the particles captured being smaller than 10 microns.