Air quality has been a major health issue in urban areas in recent decades. Human activities release a large number of pollutants into the atmosphere which has a direct impact on plant health and leads to ecosystem degradation. The objective of this study is to contribute to a better evaluation of the impact of the air quality of the city of Togo on biological resources. The determination of pollutants was done on samples of plant species with a strong link with the source of pollution. The determination of Sulfur dioxide (SO 2 ) was done by the ripper method. The determination of carbon and estimation of CO 2 and CO by the colorimetric method. The determination of nitrogen was done by the Kjeldhal method. The results showed that at the industrial level the amount of CO 2 in Alternanthera repens is high with a value of 53.3911 mg/ml. On the other hand, the quantity of CO in Senna occidentalis is 44.3619 mg/ml. In Pithecellobium dulce, the quantity of SO 2 and NO 2 are evaluated respectively to 0.1588 mg/ml and 0.3696 mg/ml. Regarding to the dumps, the quantity of CO 2 in Newbouldia laevis is very high with a value of 65.8508 mg/ml. On the other hand the amount of CO in Senna occidentalis is 51.6106 mg/ml. The quantity of SO 2 in Newbouldia laevis is 0.2101 mg/ml and NO 2 in Ocimum canum is 0.2744 mg/ml. At the level of roads, the quantities of CO 2 and CO in Eragrostis tenella are very high with values respectively equal to 74.4092 mg/ml and 62.2654 mg/ml. On the other hand, the amount of NO 2 in Amaranthus sp is 0.2304 mg/ml and that of SO 2 in Eragrostis Tenella is 0.1691 mg/ml. The use of a plant bioindicator sensitive to pollutants, allowed concluding that the air of the city of Lome is polluted.
The increase in the urban population and the high concentration of many anthropogenic activities in certain regions of the world lead to atmospheric disturbances. The excess concentration of several chemical elements leads to air pollution. In order to identify the types of air pollutants, a study was carried out in the city of Lomé, the capital of Togo. The objective of this study is to achieve a better knowledge of the types of air pollutants in the city of Lomé. The identification of the various atmospheric pollutants linked to the sources of pollution was made using micro-sensors. The standardized method was used to access target gas concentration levels. The average concentrations of NO 2 gaseous pollutants at landfills are on average 0.333 μg/m 3 ; 0.403 mg/m 3 at the industrial level, at the transport level they are on average 0.434 mg/m 3 for the morning and 0.457 mg/m 3 for the evening. Concentrations of carbon dioxide (CO 2 ) are higher in industrial areas than in others sources of pollution. The average concentration measured at this level is 1632.79 mg/m 3 . In terms of road transport, in the mornings the average concentration is 1493.23 mg/m 3 , in the evening the average concentration is 1354.09 mg/m 3 . On the other hand, they are lower at the level of the landfills, the average of which is 1265.08 ppm. The highest SO 2 concentrations are also observed only in the landfills of Port 1 and Bè_Kpota 2 with concentrations respectively and relatively low and equal to 0.081 mg/m 3 and 0.1616 mg/m 3 . The concentration of ground-level ozone is zero in industries and landfills. On the other hand, at the level of road transport, some values were recorded at the level of two road transports. These are Carrefour Attikoumé Djidjole (17.03 mg/m 3
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