A large number of different parameters from thirteen surveys are assessed on the Level II sites. The assessment intervals and number of plots surveyed vary depending on the parameter. You can find more detailed information about each survey in the menu above.
The table below provides an overview of the number of plots with available data for each survey (as of 2021).
| Survey | Number of plots |
| Leaf area index | 57 |
| Soil | 67 |
| Soil solution | 62 |
| Deposition | 63 |
| Crown condition | 65 |
| Air quality | 45 |
| Meteorology | 67 |
| Foliar analysis | 62 |
| Ozone injury | 25 |
| Phenology | 48 |
| Litterfall | 64 |
| Ground vegetation | 66 |
| Growth | 62 |
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