air pollutants are unwanted, sometimes harmful materials in the air.
Indoor air pollution is among the top five environmental health risks.
Usually the best way to address this risk is to control or eliminate the
sources of pollutants, and to ventilate a home with clean outdoor air.
The ventilation method may, however, be limited by weather conditions or
undesirable levels of contaminants contained in outdoor air. If these
measures are insufficient, an air cleaning device may be useful. Air
cleaning devices are intended to remove pollutants from indoor air.
Indoor Air Pollutants
Pollutants that can affect air quality in a home fall into the following categories:
Particulate matter includes
dust, smoke, pollen, animal dander, tobacco smoke, particles generated
from combustion appliances such as cooking stoves, and particles
associated with tiny organisms such as:
Gaseous pollutants come from combustion processes. Sources include gas cooking stoves, vehicle exhaust and tobacco smoke. They also come from:
What Types of Pollutants Can an Air Cleaner Remove?
There are several types of air cleaning devices available, each designed to remove certain types of pollutants.
Two types of air cleaning devices can remove particles from the air — mechanical air filters and electronic air cleaners. Mechanical air filters remove particles by capturing them on filter materials.
High efficiency particulate air (HEPA) filters are in this category. Electronic air cleaners such
as electrostatic precipitators use a process called electrostatic
attraction to trap charged particles. They draw air through an
ionization section where particles obtain an electrical charge. The
charged particles then accumulate on a series of flat plates called a
collector that is oppositely charged. Ion generators, or ionizers,
disperse charged ions into the air, similar to the electronic air
cleaners but without a collector. These ions attach to airborne
particles, giving them a charge so that they attach to nearby surfaces such as walls or furniture, or attach to one another and settle faster.
Gaseous Pollutant Removal
Gas-phase air filters remove
gases and odors by using a material called a sorbent, such as activated
carbon, which adsorbs the pollutants. These filters are typically
intended to remove one or more gaseous pollutants from the airstream
that passes through them. Because gas-phase filters are specific to one
or a limited number of gaseous pollutants, they will not reduce
concentrations of pollutants for which they were not designed. Some air
cleaning devices with gas-phase filters may remove a portion of the
gaseous pollutants and some of the related hazards, at least on a
temporary basis. However, none are expected to remove all of the gaseous
pollutants present in the air of a typical home.
For example, carbon monoxide is a dangerous gaseous pollutant that is produced whenever any fuel such as gas, oil, kerosene, wood or charcoal is burned, and it is not readily captured using currently available residential gas-phase filtration products.
There is an air purifier for the indoor air pollutants.
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antibacterial formaldehyde-scavenging deodorizer host and a professional
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humidity. It is applicable to places of 30 square meter, such as family
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air pollution is among the top five environmental health risks. The
best way to address this risk is to control or eliminate the sources of
pollutants, and to ventilate a home with clean outdoor air. The
ventilation method may, however, be limited by weather conditions or
undesirable levels of contaminants in outdoor air. If these measures are
insufficient, an air cleaning device may be useful.
air cleaning devices may help to control the levels of airborne
allergens, particles, or, in some cases, gaseous pollutants in a home,
they may not decrease adverse health effects from indoor air pollutants.