Ключевые слова: air, buildings, carbon, change, chimney, climate, clouds, contaminant, danger, dirt, emissions, energy, environment, environmental, factory, fog, fossil, fumes, gases, gray, harmful, heat, heavy, industrial, industrialization, industry, manufacturing, outdoors, particulate, plant, pollutants, pollution, production, sky, skyline, smog, smoke, smokestack, smoky, stacks, steam, structure, tower, toxic, urban, waste,