The annual mean, spring mean, summer mean, autumn mean, winter mean, summer maximum and winter maximum of PM10 concentrations has presented in table 1. Table 1 shows that annual mean of PM10 in Ahvaz was 261, 323.78 and 727.65 µg/m3 in 2010 until 2012. Based on result Table 1, increase in the average annual concentration of PM10 in Ahvaz since 2010 until 2012. The table 1 shows that annual average of PM10 concentration in Ahvaz which is higher than NAAQS standards. The standard of PM10 according to national ambient air quality standard (NAAQS) is PM10 (24-hour) 150 µg/m3 [26]. Number of cases of hospital admission respiratory diseases during normal and dust event days in deference seasons is presented in tables 2. Based on result Table 2, there were 721 dust event days during 2010–2012. …show more content…
The changes in the number of dust event days were similar because of continue of dust event days in recent years. During normal days the total hospital admission repository disease in 2010, 2011 and 2012 were 86, 88 and 90, whereas total hospital admission repository disease for dust event days were 24, 24 and 18, respectively. During dust event days, the number of hospital admission were significantly higher in normal days (P=0.0002). The numbers of hospital admissions respiratory disease related to particle mater on air during 2010 until 2012 has shown in figure 2. Cumulative cases of this health endpoint were estimated which were 2675, 15 and 25 in 2010 until 2012, respectively. Clearly, dominant cases of hospital admissions during dust event days were higher than normal days. In the fewest hospital admissions respiratory disease cases (n=6987) occurred in 2010 and the most (n=9818) in 2012. Dust event days were the main factor influencing the number of hospital admissions