Ключевые слова: air pollution, air quality, atmosphere, atmospheric conditions, buildings, chimney, city, cityscape, clouds, dusk, environmental, environmental impact, environmental regulation, evening, factories, factory, horizon, industrial, industrial area, industrial revolution, industrialization, manufacturing, orange sky, pollution, pollution control, pollution prevention, setting, silhouette, skyline, smog, smoke stacks, sun, sun rays, sunset glow, twilight, urban, urban landscape, urbanization,