Environmental pollution is one of the main issues of developing countries. The development of urbanism and wasteful use of fossil fuels have intensively increased pollution that causes respiratory diseases and exacerbation of heart diseases to people living in the cities. Furthermore, this plays a role as an agent in reduction and stratospheric ozone reduction. In 1999, US-EPA introduced air intensifying climate change and environmental effects including air quality quality index (AQI) to report the daily air quality of the cities. This index sensitive to changes of pollutants concentration; it means nothing except of does not consider the additive effects and interactions of pollutants. It is based on the only pollutant that has the greatest sub-index. Also AQI is not pollution data of Isfahan City. To achieve this goal the air quality data of changes in the greatest sub-index would be shown in the final index. However efforts for presenting an index showing all the pollutants of AQI and the effects of them on health is being continued. Thus in this study a new index called revised air quality index (RAQI) is been discussed considering the air higher amounts than AQI; hence, it would show the critical situations better several years (2007-2013 and 2018) were collected from Isfahan Department of Environment and Air Quality Monitoring and Control Center of Isfahan municipality and the AQI and RAQI were calculated. It was observed that RAQI showed than the other index. After doing Student’s t-test on the daily values of the the indices. On the other hand, the highest correlation coefficients among the two indices for the whole years, it was found that the difference between AQI and RAQI was significant (P 0.01) for both mean and maximum of indices and coefficient of 0.8 between AQI and RAQI represents a high correlation between the use of RAQI showed different results in comparison to AQI. A correlation two indices and the air pollutants were among the AQI, RAQI and PM 2.5 which is the main pollutant of the air quality in Isfahan City. The highest correlation coefficient calculated among AQI, RAQI and meteorological temperature and the average relative humidity. The comparison of the number of very unhealthy parameters for the mentioned time-period was observed with the average very unhealthy and hazardous days and also more clean days than AQI. Overall, and hazardous days calculated by AQI and RAQI showed that RAQI calculated more quality of Isfahan City better than AQI. the results of this research showed that the use of RAQI could present the air Key words