Common indoor biological pollutants are: bacteria, molds, viruses, animal dander and saliva, dust mites,
cockroach parts, and pollens. Biological pollutants can travel through the air and are not always easy to
see. There are many sources for these pollutants. For example, pollens and fungi come from plants and
outdoor air. Viruses and bacteria are spread by people and animals. Household pets are sources of saliva
and animal dander. Dust mites can grow in any damp, warm place. Central air handling systems and
humidifiers that are not cleaned well can spread fungi, bacteria, and other biologicals.
Common indoor biological pollutants are: bacteria, molds, viruses, animal dander and saliva, dust mites, cockroach parts, and pollens. Biological pollutants can travel through the air and are not always easy to see. There are many sources for these pollutants. For example, pollens and fungi come from plants and outdoor air. Viruses and bacteria are spread by people and animals. Household pets are sources of saliva and animal dander. Dust mites can grow in any damp, warm place. Central air handling systems and humidifiers that are not cleaned well can spread fungi, bacteria, and other biologicals.
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