Table 4.
Correlation matrix among various pollutants.
| CO2 | CO | NOx | HC | PM10 | |
|---|---|---|---|---|---|
| CO2 | 1 | — | — | — | — |
| CO | 0.19 | 1 | — | — | — |
| NOx | 0.87∗ | 0.11 | 1 | — | — |
| HC | 0.27 | 0.90∗ | 0.38 | 1 | — |
| PM10 | 0.92∗ | −0.13 | 0.74∗ | −0.10 | 1 |
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