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Which one of the following is not correct as regards to the harmful effects of particulate matter of the size 2.5 micro meters or less?

1. It can be inhaled into the lungs
2. It can cause respiratory problems
3. It can directly enter into our circulatory system
4. It can cause inflammation and damage to the lungs

Correct answer: It can directly enter into our circulatory system

Solution

PM2.5 particles are small enough to be inhaled deep into the respiratory tract and can cause breathing issues and lung inflammation. However, they do not directly enter the circulatory system as particles; their harmful effects begin in the lungs.

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