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Apophis was discovered in 2004 by the US astronomers. Since its discovery, optical and radar telescopes have tracked Apophis as it continues on its orbit around the Sun, so scientists know well its future trajectory.

Apart from guiding companies to adopt advanced international standards, the government should take innovative regulatory measures by using big data and cloud computing technologies, he said.

Apart from masks, Gejian also produces mask-making machines, goggles, thermodetectors, air purifiers and other protective equipment.

Any form of precipitation with a PH level below 5.6 is called acid rain. Precipitation with a PH level of under 4.5 is regarded as severe acid rain. Acid rain is made up of water droplets that are unusually acidic because of atmospheric pollution, most notably the excessive amounts of sulfur and nitrogen released by cars and industrial processes.

Another three typical cases were from the city of Shiyan, which had 602 confirmed cases by midnight on Saturday. The three officials were all given a serious intra-Party warning.