Question

large and coarse particles are colled​

Answer 1

Explanation:

Particles of concern can be grouped into two main categories: Coarse particles (also known as PM10-2.5): particles with diameters generally larger than 2.5 µm and smaller than, or equal to, 10 µm in diameter. ... Fine particles (also known as PM2.5): particles generally 2.5 µm in diameter or smaller.