Freelance writer Amanda C. Kooser covers gadgets and tech news with a twist for CNET. When not wallowing in weird gear and iPad apps for cats, she can be found tinkering with her 1956 DeSoto. Carbon ...

Introduction Do you filter your tap water before drinking? Maybe at home you have a water filter on your faucet, in the fridge or use special pitchers that have a filter in them. You have probably ...

Air quality monitoring unit in city center, Norwich, Norfolk, England, UK. (Photo by: Geography Photos/Universal Images Group via Getty Images) Look inside any indoor air quality device or system and ...

A closeup electron microscopy image of activated carbon, like those found in water filters. Credit: Dr. Mark Gale Activated carbon filters have become common household items as water filters in ...