Some pollution sources can be easily dealt with, but others cannot. Opening windows to increase air circulation is not always a convenient option.
As the Association of Home Appliance Manufacturers points out, ventilation is relatively poor in many modern homes, as they were designed to be "energy efficient" by reducing airflow to and from the outdoors as much as possible.
The EPA therefore also recommends the use of air purifiers to supplement these other avenues of cleaning indoor air.
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