Posts Tagged ‘air pollution’
Causes of Acid Deposition
Some industries or power plants that use low-quality fuels, the atmospheric air releasing large amounts of sulfur and nitrogen oxides. These contaminants can be transported over distances of hundreds of kilometers by air currents, especially when emitted into the atmosphere from very high chimneys that reduce pollution in the vicinity but the move to other places.
In the atmosphere of nitrogen and sulfur oxides are converted into nitric and sulfuric acid back to earth with rain or snow precipitation (acid rain). Other times, though it does not rain, are falling solid particles with acid molecules attached (dry deposition).
Normal rain is slightly acidic and lead forms carbonic acid when carbon dioxide from the air dissolves in the water that falls. Its pH is usually between 5 and 6. But in areas with polluted air by acidifying substances, the rain has pH values ??of 4 or 3, and in some areas where fog is acidic, the pH can be 2.3, ie similar the lemon juice or vinegar. Go to the top of the page
Damage caused by acid deposition
It is interesting to distinguish between: Read the rest of this entry »
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Air Pollution
There are a number of different definitions of air pollution, depending on your point of view adopted. So we have:
“Any circumstance that added or removed from the normal constituents of air, can alter their physical or chemical properties enough to be detected by medium constituents.”
Typically, only those considered as polluting substances were added in quantities sufficient to produce a measurable effect on people, animals, plants or materials.
Substances that can cause pollution
It can be a pollutant any element, chemical compound or material of any kind, natural or artificial, can remain or be pulled through the air. You can be in the form of solid particles, liquid droplets, gases or different mixtures of these forms.
Primary and secondary pollution
It is very useful to identify the pollutants into two groups with the criterion of whether they are emitted from known sources or formed in the atmosphere. So we have:
- Primary Pollutants .- Those directly from emission sources
- Secondary pollutants: – those originating in the air by interaction between two or more primary pollutants, or their reactions with the normal constituents of the atmosphere.