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Table 1Mask Classifications in USA, Europe, and China 4 . US NIOSH Europe China GBT 32610 2016 Letter Number Symbol number Symbol Detection by Sodium oxide Detection by oil N 95 P1 FFP1 80 KN90 KN95 KN100 90 95 99.97 N/A R 99 P2 FFP2 94 KP90 KP95

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China, the United States of America USA , and Australia were the top three coal producing countries in the world in 2017, in which the production of coal was million tonnes oil equivalent 1747.2 Mt, 371.3 Mt, and 297.4 Mt, respectively . Additionally, China, the USA, and Australia also have some of the largest proved coal reserves in the world.

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The COVID 19 also named as 2019 nCoV is a very contagious novel coronavirus. Though most patients contracted the 2019 nCoV will likely have mild symptoms with good prognosis, some will develop severe acute respiratory infection, pneumonia, or acute respiratory distress syndrome. Some of these patients will need anesthesia care for endotracheal intubation, critical care management and

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Nov 16, 2018 & 0183;& 32;In China, there were two kinds of respiratorsKN90\KN95\KN100 not resistant to oil and KP90\KP95\KP100 resistant to oil . The NIOSH required the N95 95% filter efficiency mask as the least depending on the workers exposure to different types of coal dust and crystalline silica . However, in China, field investigations suggested that

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PDF China has high and increasing annual rates of occupational lung diseases such as pneumoconiosis and silicosis. In contrast, Australia and the Find, read and cite all the research you

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NIOSH detection KP95 mask in USA