Critical Load/Level Values
3 µg NH3 m-3 annual mean (uncertainty of 2-4 µg NH3 m-3)
Status
UNECE, 2007
Habitat/Ecosystem Type
Higher plants
Description
Direct visible injury; species composition changes. Ecosystems where sensitive lichens and bryophytes are an important part of the ecosystem integrity, the critical level is set at 1 µg NH3 m-3.