Ключевые слова: air pollution, air quality, air testing, alert, alertness, building activity, chart, checkup, concepts, danger, dangerous, disease, environment, environmental damage, environmental issues, europe, european cultures, european union, examination, flag, gas, level testing, lung cancer, measurement, measuring, mesothelioma, natural gas, polluting, pollution, protection, radiation, radioactive, radioactive contamination, radioactive pollution, radioactivity, radium, radon, radon gas, radon test, radon testing, risk, safe, safety, screening, security, sick building, sick building syndrome, surveillance, testing,