Escola Secundária de Loulé
Described for the first time in 1872, acid rain is an unsolved problem of our time. What took nature millenniums to build has been quickly destroyed.
Though nature also produces acid rains especially due to volcanic emissions, the gases that are responsible for acid rains are mostly anthropogenic.
Most of the acid rain is due to the emission of sulphur dioxide that in contact with water produces sulphuric acid and sulphurous acid. These emissions are mainly due to the combustion of fossil fuels and by the calcinations of metallic sulphides. Nitric oxides emitted by motorized vehicles, nitric acid and fertilizer factories, thermoelectric plants and steel factories, also give origin to acid rains.
When acid rains fall at ground level, its effect can be perceived immediately: marble and calcium materials are immediately solved by these rains, metallic structures have accelerated oxidation, forests are attacked, rivers and lakes have their pH lowered with consequences for the life forms that inhabit them.
Though nature also produces acid rains especially due to volcanic emissions, the gases that are responsible for acid rains are mostly anthropogenic.
Most of the acid rain is due to the emission of sulphur dioxide that in contact with water produces sulphuric acid and sulphurous acid. These emissions are mainly due to the combustion of fossil fuels and by the calcinations of metallic sulphides. Nitric oxides emitted by motorized vehicles, nitric acid and fertilizer factories, thermoelectric plants and steel factories, also give origin to acid rains.
When acid rains fall at ground level, its effect can be perceived immediately: marble and calcium materials are immediately solved by these rains, metallic structures have accelerated oxidation, forests are attacked, rivers and lakes have their pH lowered with consequences for the life forms that inhabit them.
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