20 1 1 Modern exhaust emission standards are inseparable from automobile exhaust emissions, and the corresponding standards are based on automobile exhaust emissions.
The emissions of automobiles in the later stage are definitely smaller than those in the previous stage. For example, the national four-stage exhaust emission standard and the national five-stage exhaust emission standard are defined by new vehicle emissions. The total mass of pollutants emitted by large-displacement vehicles is greater than that of small-displacement vehicles, which causes more serious pollution to the environment and more serious harm to human health.
In 20 13, Beijing implemented the "national four-stage vehicle pollutant emission standard" (hereinafter referred to as "national four-stage emission standard") for new motor vehicles in the city, and from 2008 1, the city supplied the national four-standard automobile fuel.
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The difference between the national four emission standards and the national five emission standards;
Compared with the national standard 4, the new standard can reduce nitrogen oxide emissions of light vehicles by 25% and heavy vehicles by 43%.
According to the total number of motor vehicles registered in Shanghai is about 350,000, it is estimated that the new vehicles can reduce the emission of nitrogen oxides by about 1 10,000 tons per year. In addition, the emission control level of China's national five standards is equivalent to the fifth stage emission standards being implemented in Europe.
On the premise of not affecting power and emission reduction, the fifth national plan requires higher accuracy in the combination of components, but the external differences are not obvious. At the same time, add exhaust catalyst. The working mechanism of catalytic converter is to use precious metals (platinum, iridium, palladium, etc. ) is coated on the surface of the filter element to promote the further oxidation (combustion) of harmful components such as CO, HC and NOX in the exhaust gas into harmless substances such as CO2 and water.
Phoenix. Com -20 1 1 offers a discount of 0.8 million on the existing car of Beijing Hyundai Elantra.
Baidu Encyclopedia-National Fifth Stage Vehicle Pollutant Emission Standard
Baidu encyclopedia-automobile exhaust emission