Shanghai yesterday started banning from some roads vehicles that fail to meet a minimum emissions standard. The city would bar vehicles that failed to meet the European I emissions standard from using the elevated highway network within the city centre from 7am to 8pm, local media reported. Cars that met the standard would have to post stickers on their windshields. But critics say the city should go further by banning high-polluting vehicles completely. The Shanghai Environmental Protection Bureau estimates up to 70,000 vehicles fail to meet the standard. Shanghai had more than 2 million vehicles, including 960,000 cars, near the end of last year, official figures showed. The city started applying the European Union II standard to new vehicles in 2003 and plans to introduce the EU III standard next year. Owners of 490,000 vehicles have so far completed the procedures to secure certification. Authorities say the deadline for enforcing the ban will be October 1. Police stopped some vehicles that did not prominently display the sticker yesterday. Some drivers complained about having to get the certificate, although they supported pollution control. 'I have the sticker, I just didn't put it up,' one driver said as police pulled him over. Although experts say Shanghai's air pollution has generally improved since the 1990s, rapid economic growth is causing greater demand for cars and for electricity, provided largely by burning coal.