Both indoors and outdoors, submicron pollutants, allergens and airborne viruses, such as those responsible for the disease severe acute respiratory syndrome (SARS).can be harmful to human health. Another example of a potentially deadly airborne vector is the influenza A HINI virus (the cause of so-called "swine flu"), which, like that responsible for the common cold, is typically less than 0.1 μm in size.
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