Air & Lichen Survey NITROGEN SENSITIVE LICHENS +1 INTERMEDIATE LICHENS 0 NITROGEN TOLERANT LICHENS Pollution score automatically calculated when data is entered into the OPAL database Social questions, location information Activity: record lichens and invertebrates on 2-4 trees Tree girth and tree species Lichens: abundance score on trunk and twigs Invertebrates identified to broad groups Tar spot on sycamore Online results map
{}