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In extreme cases visibility may fall below 200 meters in those regions, it added.
Severe smog triggered red alerts in more than 20 cities at the beginning of the new year. When authorities issue red alerts, some manufacturers are required to cut production, and heavily polluting vehicles are banned from the roads.
"Before the four forms concept was put forward, inspectors only fixed their eyes on a few sick or rotten trees instead of the entire forest," said Jiang Jinquan, a senior CCDI inspector. "Now they are turning their attention to trees in the entire forest."
When meeting with Egyptian President Abdel Fattah al-Sisi, Sun Chunlan, head of the United Front Work Department of the Communist Party of China (CPC) Central Committee, hailed the long-standing traditional friendship between the two countries and continuous developments in bilateral ties.
Partly due to those efforts, Chinese cities reported less PM2.5 pollution in 2016, with the average density of PM2.5 in 338 cities falling by 6 percent.
来源：资阳报