Smile, The Air Is Fresh & Pure. A Young Laughing Boy Looking Through The Bough Of A Tree Covered In Lichens. Lichens Serve As Indicators Of Air Pollution. In Places Of Heavy Pollution, Few To No Lichens Are Found. Lichen Populations Increase Gradually With Distance From These Polluted Places And Are Used In Ecological Studies As A Measure Of Pollution Intensity. Lichens Are Therefore Excellent Bioindicators And Biomonitors

KEYWORDS

air ambigua biodiversity bioindicators biomonitors bioscience botanical bough boy branches caperata child childhood clean climate conservation country ecology ecosystem emissions environment environmental flavoparmelia forests fresh gases greenhouse growing growth habitat happiness health lichens limb ltkidspics naturalist nature parmelia parmeliopsis playing playtime pollutants pollution preservation purity quality renewal science squarrosa sulcata sustainability toxic tree trunk wilderness