1. OPAL Air Survey Activity - Lichens 1088 lichen activity results uploaded so far! Launch of ‘live phase’ 29.09.09

2. OPAL Air Survey Activity - Lichens

3. Are there ‘HOT SPOTS’ of N 2 -tolerant or N 2 -sensitive lichens ? POLLUTION SCORE NITROGEN SENSITIVE LICHENS +1 INTERMEDIATE LICHENS 0 NITROGEN TOLERANT LICHENS

4. OPAL Air Survey Activity - Lichens

5. Below 10 10-20 23-30 30-40 40-50 50-60 Above 60 NO 2 NH 3 Distribution of N 2 sensitive lichens Distribution of N 2 tolerant lichens

6. OPAL Air Survey Activity - Lichens TRUNKS TWIGS

7. OPAL Air Survey Activity - Lichens TRUNKSTWIGS NORTH WEST – Frequency of indicator lichens recorded on trunks and twigs

8. -9 -2.5-2 -8-18 -11 -32.5-5-18-18.5 -36-2 -28 -2-25 -6 Pollution scores per tree along a West – East transect through Greater London OPAL Air Survey Activity - Lichens