SHANGHAI, May 5 (Xinhua) -- More and more people in Shanghai, China's major economic powerhouse, are complaining about the increasing noise of motor vehicles, and local environmental officials and police say they now focus on dealing with drivers who blow the horn against set rules.

    However, it is difficult to catch the driver who horns in where horning is not allowed, according to the officials.

    An average of 2,198 automobiles are running on the major streets of the city per hour at daytime and 1,094 at night, according to the city's 2005 environmental report.

    The average level of traffic noise reaches 72 decibels during the day and 65.8 decibels at night, a level indicating serious sound pollution, says the report.

    Environmental officials say the key to reducing sound pollutionin the city with more than 1 million automobiles is to raise the public awareness of environmental protection, especially that of drivers. Enditem