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"Due to the installation of defeat devices, the actual operation of the vehicles can result in higher than anticipated NOx emissions", a BKA statement read.

"Environmental monitoring shows that the water quality of Baiyangdian Lake is currently affected by four key pollutants - chemical oxygen demand, ammonia nitrogen, total phosphorus and total nitrogen," Shan said. "More than 50 percent of the chemical oxygen demand and total phosphorus come from domestic wastewater and trash from villages located in and around the lake and from fish farming activities in these villages."

"Even under the best of circumstances, when you pull back on mitigation, you will see some cases appear," he said. "It's the ability and the capability of responding to those cases with good identification, isolation and contact tracing will determine whether you can continue to go forward, as you try to reopen America."

"Electric vehicles will play an increasingly important role in the demand for metals, including cobalt, lithium and nickel for batteries, copper for charging stations and aluminum for lightweight auto bodies," said Zhu Yi, senior analyst of metals and mining at Bloomberg Intelligence.

"Earlier today we requested a presidential Major Disaster Declaration and this afternoon we got it," said Newsom. "The declaration will supplement our state's comprehensive COVID-19 surge planning and make vital resources available."