Final answer:
Particulate matter such as dust, dirt, viral particles, and bacteria can remain suspended in the air and cause respiratory diseases. Pathogenic bacteria that are part of the normal microbiota of the respiratory tract do not remain suspended in the air. It is important to be aware of airborne particulate matter for maintaining respiratory health.
Step-by-step explanation:
Pathogenic particles that remain suspended in the air include particulate matter such as dust, dirt, viral particles, and bacteria. These particles can cause respiratory diseases in humans, such as pneumonia, bronchitis, and asthma. They are small enough to penetrate deeply into the lungs, making them especially harmful.
On the other hand, pathogenic bacteria that are part of the normal microbiota of the respiratory tract do not remain suspended in the air. They are typically found within the respiratory tract itself.
Overall, it is important to be aware of airborne particulate matter and take proper precautions to minimize exposure for maintaining respiratory health.