Researchers work to make filters safer
Knowing whether the filter you use is still good has always been difficult. You estimate how long you have used it and then compare that to federal standards. Researchers at Carnegie Mellon University have developed a system that uses small sensors in the filters to tell you when the filters are no longer any good.
The sensors are able to react to different chemicals such as benzene and measure whether the filter is still good.
It's an interesting article. Read it here... PittsburghLive.com
