Abstract
The main purpose of this study is to evaluate the suspended particulates (PM10) in the atmosphere under unstable atmospheric conditions. The variation of PM10was investigated and primary statistics were employed. The results show that, the PM10concentrations values ranged from 6.00 to 646.74 μg m−3. The average value of PM10is equal to 114.32 μg m−3. The high values were recorded in April and May (155.17 μg m−3and 171.82 μg m−3, respectively) and the low values were noted in February and December (73.86 μg m−3and 74.05 μg m−3, respectively). The average value of PM10of the hot season (125.35 × 10−6 g m−3) was higher than its value for the cold season (89.27 μg m−3). In addition, the effect of weather elements (air temperature, humidity and wind) on the concentration of PM10was determined. The multiple R between PM10and these elements ranged from 0.05 to 0.47 and its value increased to reach 0.73 for the monthly average of the database used. Finally, the PM10concentrations were grouped depending on their associated atmospheric stability class. These average values were equal to 122.80 ± 9 μg m−3(highly unstable or convective), 109.37 ± 12 μg m−3(moderately unstable) and 104.42 ± 15 μg m−3(slightly unstable).
Highlights
Adam [1] reviewed that the diurnal variation of temperature near the ground is one of the key characteristics of the atmospheric boundary layer (ABL) over land
Adam and El Shazly [2] evaluated the atmospheric stability at Qena and studied its diurnal variation which define the turbulent state of the atmosphere and reflect its dispersion capabilities through the period from 2001 to 2004
The high values of PM10 levels in the hot season may be connected with the high insulation levels and strong convective processes characteristic of arid regions
Summary
Adam [1] reviewed that the diurnal variation of temperature near the ground is one of the key characteristics of the atmospheric boundary layer (ABL) over land. Adam and El Shazly [2] evaluated the atmospheric stability at Qena and studied its diurnal variation which define the turbulent state of the atmosphere and reflect its dispersion capabilities through the period from 2001 to 2004 They found that there are transitional hours in which the stability conditions change from the stable nighttime period to the unstable daytime hours (6:00 and 7:00 LST). This study is to assess the level of air pollution under unstable conditions after the transitional hours at midmorning hours (9:00–11:00 LST) This time is chosen because it is usually a period of a high traffic and increase of the human activities. Trompetter et al [11] mentioned that the peaks observed during the morning period were traffic related sources alone and were unlikely to be a significant
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