Ключевые слова: air contaminants, air pollution, air quality, air quality index, airborne toxins, atmosphere, carbon monoxide, combustion, emissions, environmental, environmental degradation, fine particles, fossil fuels, harmful gases, health, industrial, industrial emissions, nitrogen dioxide, ozone, particulate matter, pollutant sources, pollutants, polluted air, polluted atmosphere, pollution sources, respiratory, respiratory diseases, smog, smoggy, smoke, smoky, urban, urbanization, vehicle exhaust,