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BEIJING, March 19 (Xinhua) -- Beijing issued a blue alert for heavy air pollution Sunday morning.

China has a four-tier warning system for severe weather, with red being the most serious, followed by orange, yellow and blue.

The first AG600 was completed in the southern city of Zhuhai in July last year, and shown to the public at the 2016 China Airshow.

"The two sides should cherish the hard-won results, enhance mutual trust and overcome disturbance to make sure that the bilateral ties will continue developing in a healthy way," said the foreign minister.

"The country targets a multi-pillar, fairer and more sustainable social security system by 2020 to better meet the needs of the elderly," said the plan released by the State Council.