Medline-Plus: Some Air Pollutants Are Poisonous To Humans

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Medline-plus states that “some air Pollutants are poisonous to us”, I agree with them because us humans are destroying air with fuel, factories, and even cars, we just don’t seem to care much for the earth we live on. Since we are contaminating air with chemicals and diseases and other stuff that can harm the earth the oxygen levels have decreased since the 1990. In the 90’s there was 21% oxygen level it has decreased over the last 20 years to 19%, although that might not look like a big deal but it is because if we keep decreasing the oxygen level we might not even have oxygen by the time the 22 century comes
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