BEIJING  -- When Li Jingmin drove to work on Monday, the Beijing resident found he had arrived at his destination 10 minutes earlier than usual.

His early arrival was due to it being the first day when half of the government's motor vehicles were kept off the roads, in line with a traffic ban issued by the Beijing Municipal Government.

"Between June 23 and July 19, only half of the 22,800 vehicles used by all-level party organs, governments and public institutions under the Beijing administration will be allowed to use the road," it stated.

The ban was among the latest pre-Olympic drives to ease the capital's traffic congestion, and more importantly, to improve air quality.

Other traffic bans include an even-odd system based on license plate numbers that will keep vehicles off the road on alternate days between July 20 and September 20 and a suspension of 70 percent of government motor vehicles during that period of time.

"This will definitely bring inconvenience when my wife and I have to turn to the subway or a car pool when my car is banned," Li said. "But it is totally understandable because air quality will become better when cars become less."

In a city where one-third of the air pollution is from vehicle exhaust, the bans are of critical importance in hosting a "Green Olympics."

"Thanks to the bans, vehicle emissions during the Olympic Games are expected to drop by 63 percent," said Du Shaozhong, Beijing Environmental Protection Bureau deputy chief.