Tuesday, December 20, 2011

DANGERS OF MOTOR VEHICLE EXHAUST GAS EMISSIONS


Danger of Vehicle Exhaust Emissions For Humans And Environment motor vehicles contain various chemical compounds. The composition of the content of their chemical compounds depending on driving conditions, engine type, fuel emission control device, operating temperatures and other factors all of which makes emission pattern becomes complicated.Type of fuel pollutants released by the engine with gasoline or diesel fuel is the same, just different proportions due to differences in engine operation.
Visually always visible smoke from the exhaust of motor vehicles with diesel fuel, which is generally not seen in motor vehicles with gasoline fuel.Although motor vehicle exhaust gas mainly composed of compounds that are harmless such as nitrogen, carbon dioxide and water ceremony, but also other compounds contained therein to be big enough quantities that could endanger the flue gases endanger health or the environment.Pollutants are mainly contained in the flue gas exhaust of motor vehicles is carbon monoxide (CO), various compounds hindrokarbon, various nitrogen oxides (NOx) and sulfur (SOx), particulates and dust including lead (PB).
Certain fuels such as hydrocarbons and organic lead, released to air because of evaporation from the fuel system. Motor vehicle traffic, can also increase the levels of the particular dust coming from the road surface, tire and brake components. After being on the air, some of the compounds contained in exhaust gas of motor vehicles are subject to change due to the occurrence of a reaction, for example by sunlight and water vapor, or also between the compounds with each other. The reaction processes are rapid and occur on the spot in the highway environment, and those that take place slowly. Chemical reactions in the atmosphere sometimes takes place in a chain reaction of a long and complicated, and produce a final product that can be more active or weaker than the original compound.
For example, the reaction in the air that converts nitrogen monoxide (NO) contained in motor vehicle exhaust gas into nitrogen dioxide (NO2) which is more reactive, and the chemical reaction between oxides of nitrogen with hydrocarbon compounds that produce ozone and other oxides, which can cause smoke clouds fotokimi (photochemical smog). Formation of smog is sometimes not the case in the place of origin of the source (city), but can be formed in the suburbs. Distance smog formation is dependent on the reaction conditions and wind speed. For pollutants that are more stable like that waste (Pb), some hydrocarbon-halogen and polyaromatic hydrocarbons, can fall to the ground with rain or with dust settles, and contaminate soil and water. The compound is then also be entered into the food chain that ultimately enter the human body through the vegetables, dairy cattle, and other products from livestock animals.Because many of the food industry today, will be able to give an unwanted impact on urban and rural communities. Motor vehicle exhaust emissions also tend to create conditions for soil and water becomes acidic. Experience in developed countries prove that this condition can cause the release of the bond soil or sediment with some minerals / metals, so metals can pollute the environment.


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