The analysis of Daily trend of air pollutants in Tehran Metropolis

In this study, used to data from six major pollutants measurable standards Tehran air containing sulfur dioxide (SO2), carbon monoxide (CO), particulate matter (PM2.5 and PM10), nitrogen dioxide (NO2) and ozone gas (O3 In a period of usually 11 years from 2002 to 2012 for a total of 4018 to analyze and assess the historical distribution of pollutants in the atmosphere in Tehran. In this study different methods included descriptive statistics, linear trend component analysis of time series in particular, descriptive statistics, polynomials, and exponential regressions and Mann-Kendall nonparametric method for detection of the significance of trends have been used. Historical trend analysis data showed that the SO2 air pollution in Tehran with a share of 3, CO, with linear, NO2 and O3, with a view to contribute degree 2 is a better fit. The particulate matter 2.5 and 10 micron did not show clear and significant trend during the study period. Results of mann -Kendall showed that the variation of pollutants CO, NO2, O3 with 95 % confidence intervals was significant, but the variability of the pollutants CO and particulate matter PM10 and PM2.5 aren’t significant. Therefore according to the historical data of some air pollutants in Tehran and is expected to continue its current NO2 air pollution in Tehran has increased significantly and will continue to air pollution in Tehran with regard to the above mentioned pollutants continue. But if emissions of CO and particulate air pollutants PM2.5 and PM10 with the current trend continues, a significant decrease of pollutants is not expected, but the current trend is expected to continue the process and pollutant emissions of CO.