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Air pollution is one of the most pressing problems around the world but more common in industrialized countries. Pollution of the atmosphere occurs due to industrialization and urbanization and has now reached a level imposing a potential threat to the health of populations as well as adverse effects upon the climate and weather. In an analytical cross- sectional study, the status of air pollution was identified in Yazd city. Air sampling was randomly performed at different settings. Our results showed that the maximum rate of pollution was due to the transportation system of the city from center to the north and east in which emission factors for carbon monoxide and hydrocarbons were found 22 PPM in Imam khomeini street and 15 PPM in the northern and eastern streets. The maximum mean variations of pollutants were related to the sulfur dioxide in winter [27-34 g/m[3]] and aerosols in autumn [241- 285 g.m[3]]. The range of variation of carbon monoxide in winter was also greater than that of other seasons [8-22 PPM]. The measurement results also showed that the amount of emission of these factors in spring and summer were about 30% more than the permissible level. However, the carbon monoxide contaminants were approximately 80% higher than the permissible level in autumn and winter. It, therefore, may be concluded that the high levels of hydrocarbons and carbon monxide were associated with the number of automobils in winter and autumn and /or with the activity of the services of schools
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Index: IMEMR Main subject: Sulfur Dioxide / Carbon Monoxide / Cross-Sectional Studies / Health Surveys / Hydrocarbons Type of study: Observational_studies / Prevalence_studies / Prognostic_studies / Risk_factors_studies Language: Fa Journal: Toloo-e-Behdasht Year: 2006
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Index: IMEMR Main subject: Sulfur Dioxide / Carbon Monoxide / Cross-Sectional Studies / Health Surveys / Hydrocarbons Type of study: Observational_studies / Prevalence_studies / Prognostic_studies / Risk_factors_studies Language: Fa Journal: Toloo-e-Behdasht Year: 2006