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Cut the foil with your cutter in half-inch increments, making multiple cuts

A higher MERV rating means the filter can trap smaller particles more effectively

Using a dryer sheet, they place some activated charcoal in the middle, wet it, and stuff it into their makeshift filter

In our tests, we found that thicker air filters were more effective at removing impurities

These results align with studies indicating greater smoking exposure in midlife and late-life may raise the risk of cognitive aging later in life, 15,42,43,44 but some studies found no association

Related topics More on this story Published30 November 2016 Published19 May 2016 Published10 December 2015