Akram Ghorbani; Marjan Ziaee; Shabnam Hoshdar Tehrani; Mitra Mohammadi
Abstract
Background and Purpose: 80% of air pollution in urban areas comes fromheavy vehicles. The purpose of this study is to investigate the amount of CO2,CO, HC, NOX pollutants, types of diesel cars and their relationship with the lifeof the car.Materials and Methods: In this study, out of all diesel cars ...
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Background and Purpose: 80% of air pollution in urban areas comes fromheavy vehicles. The purpose of this study is to investigate the amount of CO2,CO, HC, NOX pollutants, types of diesel cars and their relationship with the lifeof the car.Materials and Methods: In this study, out of all diesel cars in Mashhad, whichis 5861 cars, 425 cars were randomly selected and after recording the year ofcar production, using OPTIMA7 NDIR five-gas pollutant device in bright enginemode (Engine operation). Sampling was performed continuously (except forthe first to the fourth of April) in the period of December 6, 2017 to May 9,2017 at nine to twelve and fifteen to twenty o’clock and Then, using SPSSsoftware and statistical tests. The relationship between these pollutants andvehicle life was investigated.Results: According to the amount of sig (p=0/531>0/05) between the life of thecar and carbon monoxide, the amount of sig (p=0/571>0/05) between the lifeof the car and the amount of hydrocarbon, the amount of sig (p=0/153>0/05)between the life of the car and carbon dioxide output and the amount ofp=0/290>0/05 (sig) there is no significant relationship between car life andnitrogen oxides.There is an inverse correlation between the car’s year of manufacture andCO2 and NOX pollutants, So that the higher the car’s year of manufacture,the lower the amount of carbon dioxide and nitrogen oxides. And there is apositive correlation between HC and CO pollutants.Conclusion: The significant level value (sig) between car life and all pollutantsis greater than 0.05, so there is no statistically significant relationship betweencar life and all exhaust gas pollution. Therefore, the amount of air pollution bydiesel cars should be reduced by taking correct management methods.
Sara GHolamhosein Ghoochani; Shabnam Hoshdar Tehrani; Reza Esmaili
Abstract
Background & objeftive: Carbon monoxide is a toxic gas and since it is colorless, odorless and tasteless, it often has no warning signs for people who are at risk of this pollutant. This study focused on the spatial distribution of carbon monoxide on a monthly basis with the interpolation method ...
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Background & objeftive: Carbon monoxide is a toxic gas and since it is colorless, odorless and tasteless, it often has no warning signs for people who are at risk of this pollutant. This study focused on the spatial distribution of carbon monoxide on a monthly basis with the interpolation method in Mashhad city. Materials & Methods: In this study, data were collected from 19 metropolitan stations in the city. Then the inverse weighing intervals, ordinary kriging, and universal kriging methods were used. To determine the best spetial distribution, the root mean square error were applied .finally, the best interpolation methods was selected.with the help of geostatistical map in Arc GIS, monthly zoning map have prepared during 2017-2018. Results: The results showed that ordinary kriging is a best method rather than universal kriging and inverse weighteing due to the lees error. By providing monthly zoning map in 2017-2018, it was cleared that in the months of April, May and June, the middle belt of the city was more polluted from northwest to southeast. The estern part of city in July, August and September have been more contaminated rather than other area. The months of October, November and December wre more polluted in central part of the urban area and from the western to southwestern of the city, in December, February and March, were indicated more pollution. Conclusion: A mong the metropolitan stations for measuring air pollution, southern part of Khayam and sadaf had a highest levels of carbon monoxide and Khaghani and Elahie were lowest rate. Also, monthly zoning maps indicated that the highest pollution rate in hot season was in the eastern and in cold season was in the western part of the city. However, the amount of carbon monoxide was less than standard level during 2017-2018.