“There are newer vacuum cleaners that have different filtration systems, but we always recommend that a HEPA filter is there somewhere,” says Sanaz Eftekhari, director of corporate affairs at The Asthma and Allergy Foundation of America. “The HEPA filter will trap the matters and molecules that are coming in, so they won’t go back into the air.”

Another consideration is whether the vacuum has a bag or is bagless. While many of the bagless vacuums in our tests have low emissions, emptying the bin of a bagless vacuum can be a bit of a mess.