Greater efforts needed to clear Beijing smog

It was meant to showcase the crystal clear air sports fans and athletes will enjoy during the Beijing Olympics.

But environment expert Yang Fuqiang fears the capital's air quality didn't improve enough during the Games test period.

"Pollutants caused by car waste dropped between 15 to 20 percent during the four-day car ban in August, but I am thinking about 50 to 60 percent decrease of pollutants for next year," said Yang, who has lived in the capital for 14 years.