PSCs promote the conversion of inorganic Cl and Cl reservoir species to active Cl ( Continued) Pathway 2: HCi(g))CINO2 g in the presence of N205 HC(g)→HCI(s) HCI(S)+ N205>CINO2+ HNO3(s) Pathway 3: CIONO2 (g>HoCl(g CIONO2 H20(s)> HOCI HNO3(s) The gas phase reactions between HCl and N205, between CIoNo2 and H20 are too slow to be importantPSCs promote the conversion of inorganic Cl and Cl reservoir species to active Cl (Continued) • Pathway 2: HCl(g)→ClNO2 (g) in the presence of N2O5 HCl(g) → HCl(s) HCl(s) + N2O5 → ClNO2 + HNO3 (s) • Pathway 3: ClONO2(g)→HOCl (g) ClONO2 + H2O (s) → HOCl + HNO3 (s) The gas phase reactions between HCl and N2O5, between ClONO2 and H2O are too slow to be important