An environmental study assessed air quality at two zones, Zone P and Zone Q, situated at different distances from an industrial processing plant. Scientists sampled the abundance of three lichen growth forms on ten mature oak trees within each zone. Lichens act as indicator species for sulfur dioxide (SO2SO_2SO2) air pollution. The results are shown in the table below:
| Lichen Growth Form | Abundance in Zone P | Abundance in Zone Q |
|---|---|---|
| Shrubby lichens (highly sensitive) | 3 | 48 |
| Leafy lichens (moderately tolerant) | 12 | 35 |
| Crusty lichens (highly tolerant) | 85 | 8 |
Use the data in the table to explain which zone has the higher level of air pollution.
