Pollution score map - lichens on tree trunks

Look at pollution scores across the country

The map below shows the pollution score for each lichen survey submitted, based on the results for tree trunks only. The coloured spots give a quick indication of the local air quality. Red spots suggest poor air quality, while blue spots suggest good air quality.

What is a pollution score?
Pollution scores have been calculated for each air survey submitted. They take into account the numbers and types of lichens found and give an indication of the local air quality. The higher the score, the better the air quality.

What do these results tell us?
Discover what lichen expert Pat Wolseley has to say about what we've found so far

Compare this map with existing pollution data
Click on the pollution maps below and see if you can find any patterns.

Map 1: Nitrogen dioxide in Britain (average concentrations for 2007)

Map 2: Ammonia in Britain (average concentrations for 2005)

   Pollution score -23 to -54: Air quality poor. Nitrogen-loving lichens dominant.

   Pollution score -22 to 0: Air quality not good. Nitrogen-loving lichens present but not abundant.

   Pollution score 1 to 22: Air quality good or improving. Nitrogen-sensitive lichens present, sometimes also with
       nitrogen-loving lichens.

   Pollution score 23 to 54: Air quality very good. Nitrogen-sensitive lichens dominant.