عنوان مقاله [English]
The phenomenon of air pollution is a consequence of industrial and economic development that is sharply increasing day by day by population and urbanization increase development of transporting and extremely use of fossil fuels. Today this phenomenon has been converted to critical problem of metropolitan.
Air Quality Index (AQI) is an enhanced index of Pollutant Standard Index (PSI) and it's air quality index that indicates that whether air is polluted or not. This index explains the influence of different levels of air pollution on public health and precautions when levels of air pollution increase.
The object of this research is to analyze and study on AQI and criteria pollutants changes of air pollution from 1381 to 1391.
The results of this research indicate that density of carbon monoxide has been decreased in last decade that is a result of appropriate policy in the field of transport. By the way the mass of pullutions that enter to Tehran is way different with international standards.