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The air quality index (AQI) readings at some sites in Tianjin, a northern port city neighboring Beijing, exceeded 300 on Saturday morning, indicating serious air pollution.
During the visit, Wang also met with Swiss Federal Councillor and Foreign Minister Didier Burkhalter on Monday and discussed bilateral relations and issues of common concern.
Given their clout, China and the United States must maintain a close and friendly relationship and world peace relies on their ability to do so.
China hopes the United States will improve its own transparency and evaluation processes in an impartial way.
Governments at all levels should strive to improve agricultural quality and efficiency and the rural population's income, Li added.
来源：资阳报