damage, red, chimney, environmental, steam, environment, industry, chemical, smog, factory, background, energy, power, station, sky, stack, beige, air, ecology, sunset, pipe, smoke, copyspace, smokestack, evening, nobody, pollution, hazardous, industrial, manufacturing, toxic, technology, global, danger, white, yellow, substance, warming, condensation, pollute, wind, heat, outdoors, dirty, contamination, building, concrete, brown, harm, facility, air pollution, profession, commoner, heating, light brown, sundown, mill, cloud, unclean, impurity, person, tube, edifice, passage, application, outside, pile, crimson, suspension, heat energy, day, conduit, plant, mixture, building material, cipher, paving, heap, fabrication, soiled, flue, engineering, environmental condition, mass, batch, situation, vapor
Color smoke comes out of the smokestacks at sunset. Air pollution.