Ключевые слова: abatement, account, accountancy, accounting, air pollution, budget, business, calculate, calculating, calculator, concepts, construction industry, costs, count, danger, domestic life, economy, elements, expenditure, expense, finance, financial, gas, management, mitigation, money, natural gas, periodic, poisonous, pollution, price, protection, radiation, radioactive contamination, radioactive warning symbol, radioactivity, radon test, radon testing, reduction, residential building, risk, safe, safety, security, social issues, table,