CH 304K 1st Edition Lecture 8 Outline of Last Lecture I. Indoor Pollution and Measurements Outline of Current Lecture II. Pollution from TransportationA. Auto pollutionB. GasolineC. OzoneCurrent LectureAuto Pollution- Car exhaust includes CO, NOx, VOC’s- We would prefer for car exhaust to contain CO2, N2, H2O- How to convert them? Catalytic convertero Catalytic converters convert hydrocarbons to oxygen, carbon dioxide, nitrogen, and water- Poorly maintained vehicles have worse emissionsLeaded Gasolineo Contains tetraethyl lead additiveo Combustion makes lead oxide which is a fine powder (another PM and a neurotoxin)o Lead compounds destroy catalytic converterso Lead fuel was banned in the US in 1997, but some other countries still use itOzoneo Secondary pollutant; cars do NOT emit ozoneo Caused by the fact that engine emissions include NO2These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.o In sunlight, NO2 breaks down to NO and Oo Since O is very reactive it combines with O2 to make O3 (ozone)o “Ozone Action Days” are days that cities have to try to reduce the amount of ozone emitted by encouraging people to walk instead of driving cars or riding busseso “tragedy of the commons”: there is no one to police the air because it is common to
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