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To see your results after you have finished recording Trunks and/or Branches please click the results button (bottom right).

To see your results after you have finished recording Branches and/or Trunks please click the results button (bottom right).

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Location

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Please tap on the map to select your location.

Please provide a GB Grid Reference.
e.g. "TQ 28170 77103"

Trunk
Nitrogen Air Quality Index (NAQI): N/A
Lichen indicator score (LIS): N/A
Branch
Nitrogen Air Quality Index (NAQI): N/A
Branch lichen indicator score (LIS): N/A
The lines on this graph indicate mean values for the LIS taken from a UK wide survey.

The LIS NAQI relationship for branches should be read from the broken line and for trunks from the solid line.
Sites that are designated as:
'Clean' have an NAQI between 0 and 0.5,
'At risk' NAQI > 0.5-0.85,
'Nitrogen polluted' NAQI 0.86-1.25,
'Very Nitrogen polluted' NAQI > 1.25.

See Guide for further guidance.