Ключевые слова: air, alarm, automobile, background, carbon, clip art, clipart, co, co2, danger, design, detector, device, diagnostic, digital, dioxide, eco, ecology, element, emission, environment, environmental, equipment, fire, gas, icon, industry, instrument, isolated, measure, measurement, monoxide, no, oxide, pictogram, pollution, prevention, protection, safety, sensor, service, sign, smoke, symbol, technology, white,