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Bivariate correlation between visibility and the imported energy of each fossil fuel.
| Aviation gasoline and kerosene | Motor gasoline | Gas oil, diesel oil and naphtha | Fuel oil | Liquefied petroleum gas and natural gas | Coal products | |
|---|---|---|---|---|---|---|
| Visibility | 0.92*** | 0.73*** | 0.70*** | 0.61*** | 0.87*** | 0.61*** |
(i) The total sample size is 41.
(ii) * for p < 0.05; ** for p < 0.01; *** for p < 0.001.
