Ключевые слова: air, atmosphere, billows, buildings, carbon, change, chimney, city, climate, clouds, contamination, dark, degradation, detrimental, dioxide, dirty, effects, emissions, environmental, exhaust, factory, footprint, fumes, gases, global, greenhouse, harmful, haze, impact, industrial, industrialization, industry, landscape, manufacturing, plant, plumes, pollutants, polluted, pollution, quality, sky, smog, smoke, smokestacks, soot, stacks, toxic, unhealthy, urban, warming,