Air
Pollution: bioaerosols
What
are bioaerosols?
A healthy indoor environment is
important to you and your family. This includes keeping the air free of
biological contaminants, which can cause health problems. Scientists call these
airborne contaminants bioaerosols.
Bioaerosols are extremely small
living organisms or fragments of living things suspended in the air. Dust
mites, molds, fungi, spores, pollen, bacteria, viruses, amoebas, fragments of
plant materials, and human and pet dander (skin which has been shed) are some
examples. They cannot be seen without a magnifying glass or microscope.
Can
bioaerosols cause health problems?
They can cause severe health
problems. Some, like viruses and bacteria, cause infections (like a cold or
pneumonia). Others cause allergies. Both allergic responses and infections may
be serious or even fatal. An allergic reaction occurs when a substance provokes
formation of antibodies in a susceptible person. We call substances which will
cause an allergic reaction in some people antigens
or allergens. Bioaerosols may cause
allergic reactions on the skin or in the respiratory tract. Rashes, hay fever,
asthma (tightness in the chest, difficulty in breathing), and runny noses are
common allergic reactions.
A few people develop a severe
allergic reaction in the lung, which can destroy lung tissue. This is called hypersensitivity pneumonitis. It is not
an infection, but repeated episodes can lead to infections of the lung, such as
bacterial pneumonia.
Hypersensitivity pneumonitis can be
triggered by exposure to very small amounts of the allergen, once a person is
sensitive to it. Symptoms can range from tightness in the chest, cough, and
difficulty in breathing, to low-grade fever, muscle aches, and headaches.
What
are sources of bioaerosols in the home?
are Molds, mildews, bacteria, and
dust mites like the same conditions that we do--warmth and moderate to high
humidity. They need little more than a constant moisture supply for survival.
You may find bacteria, molds, and mildews in air conditioning equipment,
humidifier reservoirs, dehumidifier drip pans, shower heads, toilets, and ice
machines. Water damaged carpets, ceiling panels, walls, and paneling are prime
sites for new growth if they are allowed to stay damp. When molds, mildew, dust
mites, and bacteria are disrupted or release their spores into the air, this
results in bioaerosol formation.Molds and mildews develop from spores, which
are in the air all around you. As soon as spores settle in an a with the right
conditions for growth, they establish
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