What are the new findings?Filtration efficiency of a facemask
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doctor mask Our results indicate that further attention should be given to mask design and providing evidence based guidance to consumers.Mask wearing is associated with positive impacts such as short term reductions in blood pressure and increases in heart rate variability, but the exposure reduction associated with these impacts is not known.What are the new findings?Filtration efficiency of a facemask does not necessarily translate into consistent exposure reduction for individuals.Some masks marketed as highly efficient at reducing particulate exposure do not achieve the claimed exposure reduction when worn by individuals.Even the best performing masks did not always reduce exposure consistently across a range of activities.How might this impact on policy or clinical practice in the foreseeable future?This study indicates that rigorous and standardised testing, including volunteer trials face mask, should be conducted to ensure the efficacy of all facemasks available for consumer use against air pollution.Furthermore face mask, consumers and regulators should be better informed about the exposure impacts of different mask types and how to ensure that masks fits appropriately.Researchers interested in investigating the health impacts of facemasks should include measurements of exposure reduction on study participants to more accurately evaluate the impact of mask wearing on air pollution exposure.BackgroundIn China, air pollution causes around 1.6million premature deaths each year and the loss of around 31million disability adjusted life years.1 Annual average particulate matter of aerodynamic diameter 2.5 micrometres (PM2.5)concentrations in Chinese megacities well exceed the WHO’s guideline of 10g/m3 face mask, and corresponding black carbon (BC) concentrations are around 5g/m3.2 Beijing PM2.5 concentrations often reach unhealthy levels during the winter and near busy streets.3Chinese residents now have access to air quality information and can take measures to protect themselves in the short term. Studies in China have found that wearing facemasks can have positive impacts on short term health outcomes such as blood pressure and heartrate variability,4 6 although it is unclear what level of exposure reduction was associated with these impacts, given that only ambient particulate concentrations were measured.In occupational health, the term ‚respirator‘ includes a range of personal respiratory protection products, including disposable filtering facepiece (FFP) respirators face mask, sometimes referred to as ‚dust masks‘ or ‚facemasks‘, particularly in lay parlance. In this manuscript, we use the latter term (or abbreviate to ‚mask‘), as we are evaluating these devices for use in non occupational air pollution settings. doctor mask
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