The revised law aims to further reduce harmful nitrogen oxides and damaging particles contained in motor exhaust gases.

Japan already imposes restrictions on emissions from diesel engines, with the Tokyo government going further by banning diesel trucks within the metropolis.

Under the revised law passed in the upper house Friday, restrictions will extend to vehicles used by property developers in Japan's three biggest urban areas -- Tokyo, Osaka and Nagoya.

Companies building offices, hotels or other properties will have to inform local authorities of measures to control emissions, such as ensuring enough parking space to prevent heavy traffic when businesses are up and running.

The law also expands an emissions reduction plan for large shipping companies in major cities, to outlying areas.

Japan, which rapidly built its infrastructure as it developed into the world's second largest economy, has in recent years imposed some of the world's toughest regulations on pollution.

Asthma patients hold regular protests outside the headquarters of some major automakers, accusing the companies of causing their illness through diesel gas fumes.

Japan is also home to the Kyoto Protocol, the landmark treaty designed to cut the greenhouse gases blamed for global warming.

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