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Acid rain - it's measurement and prevention

Acid rain is a result of air pollution. When any type of fuel is burnt, lots of different chemicals are produced. The smoke that comes from a fire or the fumes that come out of a car exhaust don't just contain the sooty grey particles that you can see - they also contains lots of invisible gases that can be even more harmful to our environment.Power stations, factories and cars all burn fuels and therefore they all produce polluting gases. Some of these gases (especially nitrogen oxides and sulphur dioxide) react with the tiny droplets of water in clouds to form sulphuric and nitric acids. The rain from these clouds then falls as very weak acid - which is why it is known as "acid rain".

Measurement of acid rain - 

Acid Rain
Acidity and alkalinity are measured using a pH scale for which 7.0 is neutral. The lower a substance's pH (less than 7), the more acidic it is; the higher a substance's pH (greater than 7), the more alkaline it is. Normal rain has a pH of about 5.6; it is slightly acidic because carbon dioxide (CO2) dissolves into it forming weak carbonic acid.  Acid rain usually has a pH between 4.2 and 4.4.

Effects of Acid Rain -

  • Soil pollution
  • Damage to forests
  • Effect on human health
  • Effect on materials
  • Visibility impairment 
  • Effect on paint coatings

How to prevent acid rain - 

  • Use energy efficiently
  • Reuse the materials 
  • Travel by bus or train for long distances
  • Travel by cycle or by walking for small distances
  • Use high quality fuels that creates less pollution.


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