| Igeo | Geo-accumulation Index |
| Er&RI | Potential Ecological Risk Index |
| PCA | Principal component analysis |
| PMF | Positive matrix factorization |
| PRD | Pearl River Delta |
| HI | non-carcinogenic risk indices of various heavy metals across all exposure pathways |
| TRC | carcinogenic risk indices of various heavy metals across all exposure pathways |
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