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high dust suppression efficiency KN90 face mask China

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Occupational health risk assessment based on actual dust

The filtration efficiency refers to the percentage of particulate matter filtered by the filtration element under the specified detection conditions, so the filtration efficiency of the dust mask is defined as Eq. . (1) F E = C 0 C 1 C 0 × 100 % Where FE represents the filtration efficiency of the dust mask.

Focusing on Coal Workers Lung DiseasesA Comparative

Nov 16, 2018 · 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

IJERPH Free Full Text Focusing on Coal Workers Lung

China has high and increasing annual rates of occupational lung diseases such as pneumoconiosis and silicosis. In contrast, Australia and the United States of America (USA) have greatly lowered their annual rates of lung diseases since the 1970s. This paper systematically compared and analysed the multi elements of coal dust management and health management in these three countries to provide

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