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In fact, when tested, masks with PM2. 5 filters generally only block around 50% of dust, pollen, and bacteria, and only 10% of viruses. On the other hand, Enro masks with the PM0. 1 filter block over 99% of bacteria, viruses, and particles as small as 0.1 microns.
5 over a 24-hour period. Most studies indicate PM2. 5 at or below 12 g/m3 is considered healthy with little to no risk from exposure. If the level goes to or above 35 g/m3 during a 24-hour period, the air is considered unhealthy and can cause issues for people with existing breathing issues such as asthma.
By reducing air pollution levels, countries can reduce the burden of disease, and long and short-term illnesses. The WHO air quality guideline (AQG) states that annual average concentrations of PM2.5 should not exceed 5 g/m3, while 24-hour average exposures should not exceed 15 g/m3 more than 3 - 4 days per year.
For PM2. 5, short-term exposures (up to 24-hours duration) have been associated with premature mortality, increased hospital admissions for heart or lung causes, acute and chronic bronchitis, asthma attacks, emergency room visits, respiratory symptoms, and restricted activity days.
A multi-stage filtration process that includes a HEPA (High Efficiency Particulate Air) filter is ideal for capturing and eliminating PM2. 5 particles. A true HEPA filter can capture 99.97% of particles as small as 0.3m in diameter, making it highly efficient in dealing with fine particles.

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PM2.5 on EPA AirWatch Air quality categoryPM2.5 g/m3 averaged over 1 hourPM2.5 g/m3 averaged over 24 hours Good Less than 25 Less than 12.5 Fair 2550 12.525 Poor 50100 2550 Very poor 100300 501501 more row

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