01-08-2014, 11:48 AM
EMISSION STANDARDS
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WHAT IS AN EMISSION STANDARD
Emission standards are requirements that set specific limits to the amount of pollutants that can be released into the environment.
Many emissions standards focus on regulating pollutants released by automobiles (motor cars) and other powered vehicle.
They can also regulate emissions from industry, power plants, small equipment such as diesel generators.
CAUSES OF VEHICULAR POLLUTION
URBAN POPULATION
Between 1951 & 2012, the urban population has quadrupled , from 62.4 million to 377.1 million and it’s proportion has increased from 17.3% to 31.6%.
The rapid increase in the unplanned urban population has resulted in putting a load on the pollution problem.
VEHICULAR POPULATION
The increase in the urban population has resulted in an increase in a higher demand for transport. While accelerated growth in the number of vehicles, pollution stems from their concentration in a few metropolitan cities.
CONCLUSION
Diesel powered vehicles inherently emits more oxides of nitrogen and particulate matters. It is not always possible to control in-cylinder NOx and Particulate below emission legislation limit. Hence exhaust after treatment system plays vital role in controlling vehicle tailpipe emissions.
EGR, even though having many drawbacks, when coupled with DPF, can be effectively used in vehicles to control NOx production.
DPF is employed to reduce the soot content of the emission.