Table 2. Relative Occurrence Rates of the Particles According to the Size

Size range (μm)	Mineral particles	Glass particles	Road paint wear particles	Glass beads	Asphalt pavement wear particles	Tire-road particles	Fibers	Plant-related particles	Plastic particles
≥ 1,000	●			◎				●
500-1,000	●			●	◎			◎
212-500	●	●	◎	◎	◎	○	○		○
106-212	●	●	◎		◎	●	○		○
63-106	●	◎	◎		◎	●	○		○

● : Many ◎ : Moderate ○ : Few