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Abstract
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Air pollution in the form of a pseudo-natural and sometimes human-induced risk of industrialization of societies has, for years, threatened the health of humans. In recent decades, Tehran's metropolitan clean air index has been one of the most polluting cities in the world. Accordingly, the purpose of this study is to investigate a number of the most polluted air days in Tehran with the help of a number of barometric thermodynamic indices and diagrams. The data used include dry temperature, relative humidity, dew point temperature, wind direction and wind speed on the seventh and tenth of July 1394, were taken from the jet station above Mehrabad airport in Tehran, and used to plot and calculate the skewed graph. Bar thermodynamic indices including K and SI have been used. The results of this study showed that the incident of intense heat-invasive radiation on the 7th and 10th of July in 174 meters and 163 meters above ground level, as well as the atmospheric stability of the study area, were followed by K, SI and Similarly, the wind speed below this layer, which averaged less than 1 m / s, has reduced the air quality index and the passage of this index to the unhealthy condition resulting in the accumulation of various pollutants under the inverted layer.
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