Ключевые слова: acceptable, air, air pollution, air quality, air quality index, alert, aqi, background, carbon dioxide, cause, climate, climate change, contamination, cubes, danger, disaster, disease, emission, environment, environmental, factory, ghg, global warming, greenhouse gases, guideline, hand, hazard, health, high, holding, illness, index, letters, level, limit, monitoring, pollutant, pollutants, polluting, pollution, protection, quality, respiratory, risk, safety, smog, smoke, standard, toxic, warning,