Investigation of the Effect of Less-Than-2.5-Microns Dust Particles on Human Health in Isfahan City

Air pollution with suspended particles of less than 2.5 microns –due to the special combination and particles' dimension- is one of the most important hazards, threatening human health in large cities such as Isfahan. The purpose of this study is monitoring and investigation of contamination incidences due to less-than-2.5-microns dust particles in thy city, with the aim of providing proper grounds for opposing its effects in Isfahan. Autocorrelation and Dorbin-Watson's tests were used to examine time alterations and behavior of less-than-2.5-microns dust particles. For this purpose, the daily statistics of less-than-2.5-microns dust particles of 7 pollutant stations in Isfahan, during the statistical period of 2012-2016 (1391-95) , were used. findings of this study show that due to the dust particles' densities affectability of various factors with different trends; there is no time concomitance of dust particles during the year. Data-fitting with the model also manifests un absence of time autocorrelation of dust particles, also approved its being completely random. Investigation of frequency of pollutant days from years 2015 to 2016 showed that the number of days with unhealthy conditions for sensitive groups, and days with very unhealthy conditions; had decreased by about 7.7% and 2.7% respectively, indicating improvement of air quality in Isfahan. Considering that one of the main causes of mortality in polluted cities is less-than-2.5-microns dust particles, the investigation of this phenomenon, based on long-term documented information and statistics, based on the pollution standards; is assumed as the innovational aspect of this research. However, the number of days with severe contamination in Isfahan has been reduced, but the days with more pollution level, have been driven to the east and northeast areas of Isfahan.