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Correlation values between the monthly and annual time series of the number of KD onsets and PM10 mean concentrations (μg) in rural (R) and urban (U) stations located in the plains in Emilia (a) and in Romagna.
| PM10 R | PM10 U | |
|---|---|---|
| Monthly | 0.20 ** | 0.20 ** |
| Monthly anomalies | 0.05 | 0.04 |
| Annual | −0.25 | −0.32 |
| Annualdetrended | 0.06 | −0.01 |
** indicate statistical significance at the 99% level.
