Ключевые слова: air pollution, black color, cancer, cancerous, carcinogen, carcinogenic, carcinogenicity, concept, concepts, danger, dangerous, draw, drawing activity, education, hand, hazard, health, holding, ideas, inhalation, jeopardy, lung cancer, one person, paper, pen, pencil, radon gas, radon test, risk, single line, sketch, straight, toxic, toxic substance, tumor, waste, white color, writing,