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CH3041
TROPOSPHERIC CHEMISTRY
 Chemistry in the Troposphere:  
• Chemistry in the atmosphere may be classified according to the type of energy input provided to the bring about reaction.    
1) Thermochemistry
      N2 + O2      D ®  2NO    Lightning 4000oC
Thermal energy (EK > Ea) causes reaction.  
       2NO + O2  D ®      2NO2     Ambient T
nitric oxide (platelets)  nitrogen dioxide (200ppm N)
• The troposphere is a strongly oxidising environment. Oxidised products are normal.
     ( NOx = NO + NO2    nitrogen oxides )