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Range of pH value (%) in the two sampling sites: S1 (Jaworzno) and S2 (Katowice)
| Categories of pH value | S1 | S2 |
|---|---|---|
| Increased pH > 6.6 | Heavily acid pH < 4.4 | 0 |
| Slightly increased pH 6.1–6.6 | 11.8 | 17.6 |
| Normal pH 5.6–6.0 | 6 | 23.5 |
| Slightly acid pH 5.0–5.5 | 29.4 | 47 |
| Acid pH 4.4–4.9 | 5.8 | 12 |
| Heavily acid pH < 4.4 | 0 | 0 |
