Sulphur dioxide :: All vegetation types

Critical Load/Level Values: 

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

Status: 

UNECE, 2004

Habitat/Ecosystem Type: 

Forests and semi-natural vegetation

Description: 

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).

Reliability: 

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

CL reference: