Table 2.
Correlation between PM2.5 levels and the number of negative microblogs (N = 113459).
| Month | Pearson Correlation Coefficient | Statistical Significance |
|---|---|---|
| In 2016 | ||
| January | 0.752 ** | <0.01 |
| February | 0.856 ** | <0.01 |
| March | 0.930 ** | <0.01 |
| April | 0.689 ** | <0.01 |
| May | 0.732 ** | <0.01 |
| June | 0.602 ** | <0.01 |
| July | 0.626 ** | <0.01 |
| August | 0.461 ** | <0.01 |
| September | 0.734 ** | <0.01 |
| October | 0.813 ** | <0.01 |
| November | 0.711 ** | <0.01 |
| December | 0.771 ** | <0.01 |
| In 2017 | ||
| January | 0.616 ** | <0.01 |
| February | 0.887 ** | <0.01 |
| March | 0.829 ** | <0.01 |
| April | 0.841 ** | <0.01 |
| May | 0.927 ** | <0.01 |
| June | 0.527 ** | <0.01 |
| July | 0.566 ** | <0.01 |
| August | 0.610 ** | <0.01 |
| September | 0.804 ** | <0.01 |
| October | 0.846 ** | <0.01 |
| November | 0.699 ** | <0.01 |
| December | 0.823 ** | <0.01 |
Note: ** When the significance level (double test) is 0.01, the correlation is significant.