Impact Type: Direct exposure to pollutant
There is no published experimental data on the impacts of SO2 on montane heaths and scrubs. This habitat type is unlikely to occur in areas which experience levels of SO2 above the critical level. However, they may be exposed to acid deposition above the critical load see Acid deposition::Montane habitats record.
|Habitat/ Ecosystem Type||Critical Load/ Level||Status||Reliability||Indication of exceedance||Reference|
|Forests and semi-natural vegetation||
20 µg SO2 m-3 annual mean and half-year(Oct-March) mean
|UNECE, 2004||quite reliable i.e. the results of some studies are comparable||
Low temperature appears to enhance the negative effects of SO2, and the lower critical level of 15 µg SO2 m-3 is used where the effective temperature sum (ETS) (i.e. the sum of temperatures) above 5oC is below 1000 degree days (d.d) (Ashmore et al., 1994).