Ключевые слова: air, air pollution, carbon dioxide, cfc, chimney, climate, climate change, climate protection, companies, dirt, dust, economy, emission, emissions, environmental protection, exhaust gases, factory, factory smokestack, fine dust, global warming, greenhouse effect, greenhouse gas, harmful to health, haze, health, industrial nation, industry, mass production, nitrogen monoxide, particulates, pollutants, pollution, smog, smokestack, symbol,