Smoke concentration in the greater Cairo atmosphere |
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| Affiliation: | 1. Unit of Biostatistics, Epidemiology and Public Health, Department of Cardio-Thoraco-Vascular Sciences and Public Health, Padova, Italy;2. London School of Hygiene and Tropical Medicine, London, United Kingdom;1. College of Forestry, Nanjing Forestry University, Nanjing 210037, PR China;2. Jiangsu Wiscom Technology Co. Ltd, Nanjing 210021, PR China;1. 1518 Clifton Rd, Rollins School of Public Health, Emory U., Atlanta, GA 30324, United States;2. London School of Hygiene and Tropical Medicine, London, United Kingdom;3. Hassenfeld Children’s Hospital at NYU Langone, NY, NY, United States;4. Program in Public Health, University of California Irvine, Irvine, Cal, United States;5. University of Nevada, Reno, Nev, United States;6. Epidemiology and Environmental Health Joint Research Unit, FISABIO, Universitat Jaume I-Universitat de València, Valencia, Spain;7. Spanish Consortium for Research on Epidemiology and Public Health (CIBERESP), Madrid, Spain;8. Brown University School of Public Health, Providence, Rhode Island, United States |
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| Abstract: | A study of smoke content of the atmosphere over the Greater Cairo area was conducted during the 12 months from June 1977 to May 1978. Smoke samples were taken continuously over two-hour periods at two sites, one in Shubra El-Kheima industrial sector on the northern boundary of the study area and the other in a purely residential district about 15 km south-south-west of the first site.A comparison was made between the averaged concentrations at both sites. It was found that the industrial area was considerably higher in smoke contamination and that industrial activity is the principal source of smoke in the Cairo atmosphere.Daily and yearly cycles of smoke concentration were also studied and discussed in terms of man-made source activities and meteorological conditions. Concentrations were found to be much higher in the cold months. The daily cycle rhythm was the same at the two sites, having two well developed maxima in the morning and late evening and a pronounced minimum in the mid-afternoon. Daily maxima were almost of the same order of magnitude in each site. The morning maximum seemed to be formed by fumigation just after sunrise in the industrial sector and appeared two hours later in the downwind residential district.No significant difference was found between smoke concentrations during weekdays and weekends. |
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