Table 7 Correlation with the second-level air standard.
Correlation coefficient and correlation degree | ζ1 | ζ2 | ζ3 | ζ4 | ζ5 | R2 |
|---|---|---|---|---|---|---|
\(S_{1}^{\prime }\) | 1.000 | 0.832 | 0.333 | 0.646 | 0.431 | 0.648 |
\(S_{2}^{\prime }\) | 1.000 | 0.716 | 0.333 | 0.591 | 0.405 | 0.609 |
\(S_{3}^{\prime }\) | 1.000 | 0.775 | 0.536 | 0.743 | 0.333 | 0.677 |
