Ключевые слова: air, asian, backgrounds, blue, building, business, businessman, chemical, chemistry, chinese, climate, cloud, concept, contamination, damage, dioxide, dirty, disease, ecology, emissions, energy, environment, exhaust, factory, fuel, fumes, gas, global, health, industry, manufacturing, mask, pipe, pollution, power, refinery, sad, sky, smog, smoke, stack, steam, technology, tower, toxic, vapor, warming, waste, young,