At once cover the mouth of the tube with a filter-paper cap moistened with saturated aqueous solution of silver nitrate (1:1).

In a blog post in 2016, it detailed what went into the system’s design, along with testing data to back up its claims of a HEPA filter that’s “ten times more efficient than standard automotive filters.”

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Once the nearby filter is selected, users will see a new UI that Google is calling a “local stores card,” also constructed of local inventory data from merchant feeds.

Somehow, though, I doubt that consumers rush out of the grocery store filter aisle and straight to the testing authorities.

Hmmm, Google already had a filter set to not pass all Search Terms into the UI based on traffic volume, so this appears to be them simply moving the threshold.

Basically, my mother said with a touch of embarrassment, everyone else seemed to have a filter, so they bought one, too.

Even when they’re available, portable air filters can be expensive, easily costing up to several hundred dollars for a device big enough to clean the air in a single room.