Keywords
air pollution, blue sky, chimney, clear sky, color, day, emission, energy, environment, environmental issue, factory, february 2007 release, gray colour, image source, industrial plant, industry, nobody, outdoor, pollution, sky, smokestack, structures, weather, stock image, images, royalty free photo, stock photos, stock photograph, stock photographs, picture, pictures, graphic, graphics, fine art prints, print, poster, posters, mural, wall murals, is368-067, is368 067, is368067