Sulphur dioxide :: All vegetation types

Critical Load/Level Values: 

20 µg SO2 m-3 annual mean and half-year(Oct-March) mean

UNECE, 2004
Habitat/Ecosystem Type: 
Forests and semi-natural vegetation

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).

quite reliable i.e. the results of some studies are comparable

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