Which one of the following is considered to be the finest particulate matter?

Correct option is B

Nucleation mode particles are considered the finest particulate matter due to their extremely small size, generally measuring less than 0.1 micrometers (µm) in diameter. These particles are often formed through processes like gas-to-particle conversion and are the smallest among the categories of particulate matter.
Information booster:
· Fine mode particles: These typically refer to particles less than 2.5 micrometers (PM2.5) but include a range of sizes larger than nucleation particles.
· Aitken mode particles: These are larger than nucleation mode particles, usually in the range of 0.01 to 0.1 micrometers.
· Accumulation mode particles: These are even larger, usually ranging from 0.1 to 2.5 micrometers in diameter.
Additional Knowledge:
1. Nucleation mode particles are particularly important in atmospheric chemistry, as they can grow by coagulation and condensation to form larger particles.
2. These particles are often studied in relation to air quality and health impacts due to their potential to penetrate deep into the respiratory system..