Nitrogen oxide :: All vegetation types

Critical Load/Level Values: 

30 µg NOX (as NO2) m-3 annual mean; 75 µg NOX (as NO2 ) m-3 24-hour mean

UNECE 2004
Habitat/Ecosystem Type: 
all vegetation categories

The concentration units are referenced as if all the NOX were in the form of NO2. (see Unit Conversion). The level for NOX should only be applied where levels of SO2 and O3 are close to their critical levels.

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

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