Ключевые слова: air pollution, architecture, blue, built structure, chemical plant, color image, day, environment, factory, fog, fossil fuel, freight transportation, fuel and power generation, fumes, global warming, horizontal, industrial objects equipment, industry, nature, nature symbols metaphors, no people, objects equipment, oil industry, outdoors, photography, photography themes, pipe, pollution, refinery, sky, smog, smoke, smoke stack, steam, steel, storage tank, technology, tower,