Option C, The most problematic particles range from 0.1 to 2.0 microns. These tiny particles often enter the lungs through the nose and throat and harm human health.
Particles between 0.1 and 2.0 microns in size can go deep into your lungs and even enter your bloodstream in rare cases. The biggest threat to human health comes from tiny particles, also known as PM2.5, which have a diameter of less than 2.5 micrometers. The most hazardous particle matter human health because of how easily they may be inhaled due to their small size. particles enter your lungs after being breathed and are immediately absorbed into your circulation.
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