| Site Information | Number of | Correlation of ozone with | Variance | ||
| Reference Paper | City/Country | predictors used | Temperature | Previous day’s ozone | Explained (%) |
| Kovac-Andric et al., 2009 [30] | Osijek/Croatia | 3 | Not reported | Not reported | 77 |
| Chaloulakou et al., 1999 [31] | Athens/Greece | 7 | Not reported | Not reported | 43 |
| Ziomas et al., 1995 [32] | Athens/Greece | 6 | Not reported | Not reported | 59 |
| Papanastasiou and Melas, 2008 [33] | Volos/Greece | 7 | 0.75 | 0.90 | 86 |
| Sousa et al., 2007 [34] | Oporto/Portugal | 5 | Not reported | Not reported | 49 |
| Barrero et al., 2006 [35] | Errenteria/Spain | 6 | 0.38 | 0.70 | 60 |
| Tecer et al., 2003 [36] | Istanbul/Turkey | 8 | 0.48 | 0.48 | 71.5 |
| Di Carlo et al., 2007 [23] | L’Aquila/Italy | 4 | 0.43 | Not reported | 62 |