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Wednesday, 23 April 2008

The air pollution (or air pollution) is a type of pollution defined by an alteration of clean air by one or more substances or particles present in concentrations and for sufficient time to create a toxic effect or ecotoxic. There are now tens of thousands of different molecules, pollutants known or suspected, many of which act in synergy among themselves and with other parameters (solar UV, ozone, humidity, acids, etc.). . The effects of these synergies are still poorly understood.
 

The air pollution has some ancient sources, we know today that the air inside many houses traditional, smoke-filled homes by poorly designed, is harmful to health.The dust, smoke and fumes emitted by mines lead, copper and mercury from ancient Rome have left until the ice at the North Pole.But in the nineteenth century is a significant and chronic pollution has covered the cities of the industrial revolution.


Motor vehicles
Motor vehicles, more and more numerous, emit toxic gases: carbon dioxide, carbon monoxide… into the upper atmosphere with airplanes and rockets. And most drivers rely on fossil fuels (oil, coal, natural gas), a source of pollution, which has considerably worsened in the world since the beginning of the twentieth century. Pres 25% of greenhouse gases are emitted exhaust pot of automobiles.D 'Junior Science and after 2004, in 10 years, a billion vehicles circulate in the monde.Tant that in 23 years, of 1985 2008, the change of fuel consumption is still limites.Precisement, cars most sober envrion save 0.3 litres of petrol per 100 kilometers. The weight of the car (shockproof reinforcements, air conditioning ,...) increases the average weight of the car, so the quantity of fuel it consumes.

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The energy production
The increasing energy needs and their satisfaction leads to increasing pollution on the planet, including China, which in 2006 became a [2] the largest emitter of CO2 with the relocation of a large part of the production of rich countries ( China uses 69% of its coal for energy production, which is a rate 42 times higher than the world average). China remains, however, behind the USA in terms of CO2 emissions per capita. In 2007, a coal plant would start up every 3 days, each developing the power of a nuclear reactor.

Industries  carnon dioxide

The manufacture of most household goods in the world leads to the release of toxic chemicals in the atmosphere. This is especially true for the manufacture of plastics. According cases and countries, companies are controlled and / or must produce or own assessment of their emissions. In Europe, some data must be public (Aarhus Convention) and transmitted to a European register of releases and transfers of pollutants (replacing the old register European Pollutant Emission (EPER), brought to France by the Order of January 31, 2008 and a national registry; soil, water and air must be taken into account, for companies producing dangerous products to over 2 tpa, and non-hazardous waste to more than 2,000 t / year. On 13 March 2008, a circular added 22 air pollutants and 22 of water to the old list of substances.

 

Carbon dioxide

Although carbon dioxide is not toxic in themselves, and actually promotes the growth of plants, environmentalists have highlighted in the 1990's that excess carbon dioxide is a form of pollution, because of its Action in the process of global warming (greenhouse gas). This is why the Kyoto Protocol, which entered into force in 2005, established a timetable for reducing emissions.
Last Updated ( Thursday, 03 July 2008 )
 
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