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In Beijing, all new buses and other heavy-duty diesel vehicles shall follow the new emission rules, while all new vehicles are expected to follow suit starting Jan. 1, 2020.

Yan Ligang, the fair's spokesperson, said 11 venues saw more than 400,000 visits by participants from 137 countries and regions and 21 international organizations.

Besides, on the sidelines of the G20 summit, Xi also attended a meeting of BRICS nations, China-Africa leaders' meeting, China-Russia-India leaders' meeting, and held a series of bilateral meetings.

The Chinese side has lodged solemn representations with the countries, Geng said, urging the relevant countries to respect the facts, abandon prejudice, abide by the purposes and principles of the UN Charter, and stop politicizing human rights issues and using the issue of Xinjiang to interfere in China's internal affairs.

"Chongqing will strive to play a supporting role in promoting the development of western China in the new era, play a leading role in facilitating the construction of Belt and Road and the green development of the Yangtze River Economic Belt," Chen said.