Ключевые слова: air, blue, chimney, contaminant, contamination, danger, dioxide, dirty, ecology, effect, emitting, energy, environment, environmental, factory, fume, gas, global, greenhouse, health, impurity, industrial, industry, nature, oxygen, pipe, plant, pollutant, polluter, polluting, pollution, powerplant, problem, problems, protection, sky, smog, smoke, smoky, steam, technology, toxic, warming, water, white,