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Among them, Baoding city in Hebei, about 140 kilometers southwest of the capital, boasts the best achievement, with its average concentration of PM 2.5 during the period lowered to 53 micrograms per cubic meter, falling by 36.1 percent from the same period of 2018, according to the report.

Amid a worsening pandemic, the US continues to break records with the number of cases and deaths. The death toll from COVID-19 was 257,415 on Monday, according to data from Johns Hopkins University. There were 142,732 new coronavirus cases on Sunday. That day, 921 people died. On Friday, there was a record high of 196,000 cases, and more than 83,870 people are in hospital with the virus.

Amazon’s next tower set to open in summer 2016. (GeekWire Photo, Jacob Demmitt)

Amid strong criticism of his handling of the pandemic, Trump said "99 percent of COVID-19 cases in the United States were totally harmless", without giving evidence. In fact, many US states marked a record number of new cases over the weekend.

American Airlines also suspended its US-China passenger service in February. It announced in March that it planned to restart flights from Dallas to Beijing and Shanghai, as well as flights from Los Angeles to Beijing and Shanghai on Oct 24.