Sunday, September 25, 2011

Air pollution



Air pollution may be defined as the presence in the air (outdoor atmosphere) of one or more contaminants or combinations thereof in such quantities and of such durations as may be or tend to be injurious to human, animal or plant life, or property, or which unreasonably interferes with the comfortable enjoyment of life or property or conduct of business.
It is a substance or effect dwelling temporarily or permanently in the air , which adversely alters the environment by interfering with the health, the comfort, or the food chain, or by interfering with the property values of people.
A pollutant can be solid (large or sub-molecular), liquid or gas .
It may originate from a natural or anthropogenic source (or both).
It is estimated that anthropogenic sources have changed the composition of global air by less than 0.01%.
However, it is widely accepted that even a small change can have a significant adverse effect on the climate, ecosystem and species on the planet.
Examples of these are acid rain, ozone in the lower atmosphere, and photochemical smog.
Air pollution is responsible for major health effects.  Every year, the health of countless people is ruined or endangered by air pollution.
Many different chemicals in the air affect the human body in negative ways.  Just how sick people will get depends on what chemicals they are exposed to, in what concentrations, and for how long.
Studies have estimated that the number of people killed annually in the US alone could be over 50,000.
Older people are highly vulnerable to diseases induced by air pollution.  Those with heart or lung disorders are under additional risk.  Children and infants are also at serious risk.
Because people are exposed to so many potentially dangerous pollutants, it is often hard to know exactly which pollutants are responsible for causing sickness.  Also, because a mixture of different pollutants can intensify sickness, it is often difficult to isolate those pollutants that are at fault.
Many diseases could be caused by air pollution without their becoming apparent for a long time.  Diseases such as bronchitis, lung cancer, and heart disease may all eventually appear in people exposed to air pollution.
Air pollutants such as ozone, nitrogen oxides, and sulfur dioxide also have harmful effects on natural ecosystems.  They can kill plants and trees by destroying their leaves, and can kill animals, especially fish in highly polluted rivers.
Recovered by: Ricardo Flores

6 comments:

  1. the air pollution is the cause of many diseases because of the gases you can fain in the air, besides the air carring the germs that cause infections like the flue, long infenctions, cough,as some of them

    eva alicia huepa

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  2. Currently one of the biggest problems is the pollution of iare because there a lot of fabricao or simply million cars and emit many gases harmful to people.

    By: Alan Flores

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  3. in particular believe that the first factor in air pollution ourselves with factories, fuel, cigarettes, etc.
    Besides that we have time to correct this problem before poorly maintained that nature kills us.
    Adriana herrera

    ReplyDelete
  4. air pollution is high risk to our health because it causes many diseases I think everyone should do something to lessen this problem
    sandra coyotl tlachi

    ReplyDelete
  5. Pollution is the most frequent problems and delicate and cities like Guadalajara
    Toluca Monterrey Mexico City are among the most polluted in the country. Urgent action is needed to these problems because I think it could become one of the leading causes of death not only in Mexico are also in the world.

    Isabel Sarabia

    ReplyDelete