Read the below statements marked as Assertion (A) and Reason (R). Mark the correct options:
Assertion (A): PM2.5 is more harmful than PM10 in AQI.
Reason (R): PM2.5 particles are smaller and can reach deep into the lungs and bloodstream.
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. Both A and R are true, and R is the correct explanation of A.
PM2.5 and PM10 are types of particulate matter classified by their size in microns (10⁻⁶ meters). PM2.5 (fine particles) is considered significantly more dangerous than PM10 (coarse particles). This is because PM10 particles are usually filtered out by the nose and throat, but PM2.5 particles are so tiny that they bypass these natural defenses. They travel deep into the alveoli (lung air sacs) and can even enter the bloodstream, leading to severe respiratory and cardiovascular diseases, as well as systemic inflammation.