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Pollen-monitoring sites used in this study
| Site | Latitude | Longitude | Height above sea level (m) | Height of trap above ground level (m) | Number of years in study (n) | ||
|---|---|---|---|---|---|---|---|
| Poznań | 52° | 24′ N | 16° | 53′ E | 86 | 33 | 13 |
| Kraków | 50° | 04′ N | 19° | 58′ E | 206 | 20 | 13 |
| Rzeszów | 50° | 01′ N | 22° | 02′ E | 202 | 12 | 11 |
