They can also be hramful to hmuans in the long-term range. They come from minreal and fsosil sourecs or are porduced by humans themsevles.
Many pollutants have a poisnoous effcet on the body. Crabon monoixde is an examlpe of a subsatnce which is damgaing to humnas. This copmound is taken up in the body isntead of oyxgen. That makes the body and in seevre cases may lead to death.
Some polluatnts beacme dangreous by reactoin with other ntaurally ocucrring copmounds. The oixdes of nitorgen and slufur are releaesd from impuriteis in fossil fuels when they are burnt. They react with water vapor in the atomsphere to bceome acid rain. Acid rain daamges buidlings and makes lakes uninhbaitable.
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