Size:N99 Filter Specification Filter N99 (99.999% protection from particles) 7 Layer Filter (including Carbon activated filter) Machine washable Protection from PM10 to PM0.3Box Content2 x N99 Filters2 x 2 way vents100% Satisfaction or your money back.Click on buy box now.Nearly four in 10 people (38.9 percent) in the United States live in counties that have unhealthful levels of either ozone or particle pollution. More than 125 million Americans live in 204 counties where they are exposed to unhealthful levels of air pollution in the form of either ozone or short-term or year-round levels of particleshttp://www.lung.org/assets/documents/healthy-air/state-of-the-air/state-of-the-air-2017.pdfREF: 2017 report by The American Lung AssociationAir pollution kills 13,000 a year. These estimates are based on a study that modelled the levels of pollution across the UK and predicted its impact on premature deaths. The study combined UK and EU emissions data with models of weather and the ways in which chemicals disperse. This allowed researchers to estimate the impact of pollution across the UK. According to the model, pollution from overall UK combustion emissions causes approximately 13,000 premature deaths a year, with road transport being the biggest source. A further 6,000 deaths are estimated to be due to European Union emissions produced outside the UK. Long-term exposure to particulate matter (pollution) has been associated with premature death in many previous studies. By analysing the spread of people across the country, this new research provides an interesting estimate of how the UK population is specifically affected. However,
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