Table 3.

Cross-correlation values between the daily incidence of infection and the PM10 concentration obtained varying the lag between the two series.

Lag (Days)	8	9	10	11	12	13	14
Bergamo	−0.15	0.20	0.47	0.28	0.20	−0.14	−0.40
Brescia	−0.14	0.09	0.43	0.35	0.30	−0.13	−0.42
Como	−0.30	0.20	0.53	0.09	0.11	−0.12	−0.34
Cremona	−0.05	0.12	0.30	0.26	0.27	−0.14	−0.43
Lecco	−0.30	0.23	0.52	0.16	0.14	−0.13	−0.36
Lodi	−0.09	0.17	0.27	0.17	0.19	−0.16	−0.42
Mantova	−0.04	0.02	0.33	0.41	0.34	−0.18	−0.38
Milano	−0.18	0.22	0.54	0.17	−0.01	−0.23	−0.43
Monza	−0.21	0.24	0.61	0.25	−0.04	−0.22	−0.38
Pavia	−0.09	0.29	0.33	0.06	0.04	−0.19	−0.36
Sondrio	−0.33	−0.09	0.32	0.11	0.24	−0.01	−0.21
Varese	−0.32	0.17	0.61	0.15	0.06	−0.18	−0.38