Stratospheric Ozone Depletion

PSCs promote the conversion of inorganic Cl
and Cl reservoir species to active Cl
(Continued)
• Pathway 2: HCl(g)ClNO2 (g) in the presence of
N2 O5 HCl(g) HCl(s)
HCl(s) + N 2 O 5
ClNO 2 + HNO 3 (s)
• Pathway 3: ClONO 2 (g)HOCl (g)
ClONO 2 + H 2 O (s)
HOCl + HNO 3 (s)
The gas phase reactions between HCl and N 2 O 5 ,
between ClONO 2 and H 2 O are too slow to be important.