ution, if not all, is caused by humans in the formed of vehicles, industries etc. The accidents in which man has no control over such as volcanic eruptions, lightning, decay etc are a cause for the different pollutants in the atmosphere but nothing can be done to avoid this. But this is not a great risk to the atmosphere and us when one considers that 90% of the sulphur dioxide in our atmosphere and 95% of nitrogen oxides is caused by man. Which leaves about 10% and 5% respectively are caused by nature which is very minimal. The biggest problem about "acid rain" is that it does not stay where it was created. Since acid rain takes many forms, it will travel everywhere and create itself somewhere else thru the aid of wind, water, etc. The United States is well known to be a big part of the pollutants in the world; for example is it believed that 50% of the "acid rain" in Canada is caused by the pollution in America. It is important to know that pollution is not the only cause of "acid rain". If you take rainfall as an example, even if there is no pollution at all in the atmosphere, the rain itself is still acidic. The rain in rainfalls has a pH of roughly 6.0. The cause of this is because there is carbon dioxide in our atmosphere and when it mixes with water it created carbonic acid. Since this is not a perfect world, there will always be pollution in the world and because of these pollutants it affects the pH level and makes it drop. When the pH level reaches below 5.5 it is classified as "acid rain". The lowest ever recorded pH level was around 2 – 2.5.
             Acid rain affects almost everything. It affects plant life, aquatic life, animals, human beings and much more. The first effect is on plant life. Any kind of vegetation either it be natural vegetation or crops it is affected. The roots get damaged by acidic rainfall, which will cause the plant to die or have an abnormal growth. The differe...