Chap 2.3. Gaseous Pollutants. Carbon oxides Sulfur compounds Nitrogen compounds Hydrocarbon compounds Photochemical oxidants. Carbon Oxides. Two major carbon oxides Carbon dioxide (CO 2 ) Carbon monoxide (CO). CO 2. Natural atmospheric constituent Sources: Natural
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What’s the impact if there is no CO2 in the atmosphere?
Is CO2 emission regulated? Should it be?
More discussion in Atmospheric Effects
M: an energy absorbing molecule, e.g. N2 or O2
OH·: hydroperoxyl radical
O(3P): ground-state atomic oxygen
h: a photon of light energy
Data from http://www.uea.ac.uk/~e490/su/sulfur.htm
H2SO4: sulfuric acid
H2SO3: sulfurous acid
HNO2: nitrous acid
H2O2: hydrogen peroxide
More discussion in Welfare Effects
More details about NO formation in Reaction/Kinetics
(removed by dry & wet deposition)
NOx Sink Processes
NO to NO2 to HNO3
1st pathway produces OH· for oxidizing other NMHC
Figure 2.5Methane (CH4)
Semi-volatile Halogenated HCs
CH3Cl, CH3Br ~ 1 year
CH3CCl3 ~ 6.3 years
CCl4 ~ 40 years
CFCl3 ~ 75 years
CF2Cl2 ~ 111-170 years
Is O3 level high or low at a highway tollbooth?
This doesn’t explain the high level O3 in smog! What’s wrong?
Figure 2.6Photochemical oxidants: O3
20 ppb under solar noon
conditions in mid-latitudes