Air pollution is caused by the gasses that are released into the air, these include the exhaust released from cars, the gas from factories and even the gas produced when cows pass wind (this contains methane)!
To see the effect of air pollution for ourselves, we took paper towels and rubbed objects inside, before going outside and rubbing things like cars. Check out the difference between these two types of objects!
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Paper rubbed on objects inside Paper rubbed on objects outside
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