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Effectiveness of face masks used to protect Beijing ...

Jun 01, 2018 · Methods Nine masks claiming protection against fine PM (PM 2.5) were purchased from consumer outlets in Beijing.The masks’ filtration efficiency was tested by drawing airborne diesel exhaust through a section of the material and measuring the PM 2.5 and black carbon (BC) concentrations upstream and downstream of the filtering medium. Four masks were selected for testing on volunteers.

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World's largest air purifier takes on China's smog

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Particulate Matters: Why monitor PM10 and PM2.5?

Apr 06, 2020 · Keep in mind that due to how the scale is built, PM 10 (coarse) also automatically contains PM 2.5 (fine) and PM 1.0 (ultrafine). Additionally, PM 2.5 (fine) contains PM 1.0 (ultrafine) as well. To put things into perspective, human hair has a diameter of 50 …

Author: Jason Thongplang

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Our service department is also performing pick-up and drop-off of repair bikes outside. We are not allowing any bike rentals or demos until further notice. For online customers, BikeParts is running at normal capacity as are our shipping companies USPS and Fedex. We have experienced very few delays for most of our US customers over the 2 weeks.

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