Ключевые слова: air pollution, air quality, canopy, concept, concepts, conservation, danger, dangerous, ecology, ecosystem, emission, environment, environmental, environmental conservation, environmental damage, environmental issues, gas, health, healthy lifestyle, ideas, illness, leaf, mesothelioma, mitigated, mitigation, molecule, natural, natural condition, natural gas, natures, outdoors, plant, poisonous, polluted, pollution, radiation, radioactive contamination, radioactivity, radon, radon gas, radon test, reduction, risk, sky, tree, trees, treetop,