CHM136H1 Chapter Notes - Chapter 8: Exhaust Gas Recirculation, Nitric Oxide, Aluminium Sulfate
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CHM136H1 Full Course Notes
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0. 04 pollutant: substance which has a harmful e ect on the environment + is present at concentrations > than its natural levels due to human activity. Increase of co2 due to burning of fossil fuels toxicity average length of time pollutants remain in the environment before becoming harmless by natural processes. Primary pollutants: emitted directly in the atmosphere e. g. co2 produced by combustion of fossil fuels, carbon monoxide (co), sulfure dioxide (so2), nitrogen monoxide (no)+ volatile organic compounds (vocs)- hydrocarbons. Secondary pollutants: produced when primary pollutants undergo chemical change in the atmosphere. Carbon monoxide toxic to humans > a ects oxygen uptake in blood absorbed by lungs binds to hemoglobin (hb) in red blood cells more e ectively than oxygen. Hb + co = cohb hemoglobin + carbon monoxide = carboxyhemoglobin prevents oxygen from being transported about the body cause dizziness at low concentrations fatal at high levels colourless + odourless: hard to detect.
