A Simple Solution for India's Soot Belching Buses and Trucks

Treehugger has this entry about a device that has been making waves in green circles over here: http://www.treehugger.com/files/2008/10/eco-friendly-car-filtration-device-blade.php The thing looks simple enough: a filter that traps pollutants emitted by vehicle exhausts. While the designs on this page are meant for extremely clean California Spec cars, there is no reason why bigger ones could not be manufactured and mounted on the filthy trucks and buses that run all over India poisoning the air. Yes, the filters would also have to be changed more often in India, but, on the whole, this would be a good product to use there. Now, is there any way to make Ashok Leyland, Tata and others look at this? Anybody know?