Table 1.

Seasonal variations of microplastics impact indices in the sediments of the two wastewater sites

Seasons	Site 1 (S1)					Site 2 (S2)
	$\mathit{CFj}$	$\mathit{PLIj}$	$H$	$\mathit{Tj}$	$\mathit{RI}$	$\mathit{CFj}$	$\mathit{PLIj}$	$H$	$\mathit{Tj}$	$\mathit{RI}$
Winter	193	14	403	1.16	223	212	15	400	1.05	223
Spring	141	12	463	1.8	259	174	13	519	1.7	290
Summer	215	15	420	1.04	223	263	16.5	449	0.96	251
Autumn	173	13	410	1.29	223	198	14	470.7	1.321	263
1 year	181	13.5 (medium)	416 (level III)	1.28	232 (level II)	212	15 (medium)	460 (level III)	1.21	257 (level II)

CFj contamination factor, PLIj pollution load index, H polymer risk assessment index, Tj toxicity coefficient of MPs, and RI potential ecological risk index