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Regardless of what brands and marketing materials may claim, they are typically not effective against cigarette smoke

Changing the filter every 90 days is usually enough if you don't have pets or allergies

A HEPA filter is rated to remove at least 99.97% of dust, pollen, mold, bacteria, and any airborne particles with a size of 0.3 microns (m). Since these air purifiers efficiently filter out even the smallest particlessuch as fine particulate matterZhao says they can be very helpful in clearing smoke from the air

With his skills and the resources of a top pulmonary hospital in Ahmedabad, you can take the first step toward a healthier, smoke-free life

In fact, the aforementioned study suggests they may cut the level of such irritants by half