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Think of air pollution and you may think of gas-guzzling cars emitting harmful fumes or smokestacks on factories sending gray clouds into the sky. But indoor air pollution can be a problem, too. Dust mites, mold spores, pollen, and pet dander in the air inside your home can cause problems if your family has allergies or asthma. Using HEPA filters can trap these pollutants and may help bring allergy relief.
How HEPA Filters Work
HEPA stands for high-efficiency particulate air. A HEPA filter is a type of mechanical air filter; it works by forcing air through a fine mesh that traps harmful particles such as pollen, pet dander, dust mites, and tobacco smoke.
HEPA filters were invented during World War II to keep radioactive particles from escaping from laboratories. To qualify as a HEPA filter, it must capture at least 99.97% of all particles as small as 0.3 microns in diameter. A micron is one-thousandth of a millimeter. A particle measuring 0.3 microns would have to be enlarged 150 times to be seen with the naked eye.
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