Power Plant, Smoke, City, Urban, Town, Metropolis, Watercraft, Vehicle, Vessel, Transportation, Factory, Pollution, Refinery, Nature, Fog, Office Building, air, atmosphere, blue, chemical, chemistry, chimney, city, climate, cloud, clouds, condensation, dirty, dust, effect, emissions, energy, environment, environmental, factory, fog, fuel, fumes, gas, gas global, industrial, industry, manufacturing, nature, pipe, plant, pollution, power, refinery, sky, smog, smoke, station, steam, technology, toxic, water, white, facility, air pollution, profession, engineering, egress, mill, unclean, discipline, impurity, district, tube, passage, application, suspension, particulate, conduit, metropolis, mixture, urban area, emission, urban center, fabrication, mood, outcome, soiled, science, flue, environmental condition, consequence, vapor
Factory chimneys and clouds of steam.Blue sky