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Scientists have discovered a gap in the protective ozone layer around the earth.

But first, let’s talk about air pollution:

Air pollution is mostly caused by human activities. Exhaust fumes from motor vehicles are one of the main pollutants. They contain greenhouse gases which are thought to contribute to global warming. They also contain substances such as sulphur and nitrogen oxides that can cause damage to our lungs.

Pollutions are largely produced as a result of more industries and their manner of waste disposal. In many countries industrial pollution is now controlled, but it still causes a large amount of damage to our health and the environment in many developing countries.

Another recent form of pollution came from parts of Asia where they were burning down the rainforest to clear the land for farming.

Now back to aerosols:

Ozone, a form of oxygen, filters out more than 90 percent of the sun’s harmful rays. The hole in the ozone layer has been blamed on our use of chemicals called chlorofluorocarbons (CFCs). They were widely used in refrigerators, freezers, and aerosol cans.

The use of CFCs has now been heavily restricted, but it may take many years before the ozone layer actually repairs itself.

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