Ozone depleting substances


Hydrogen (H2) and hydrocarbons (CxHy) absorb ultra-violet (UV) light. They protect a planets surface from excessive UV radiation. These gases are removed by Oxygen (O2) when a planet is terraformed. The planets surface is then exposed to UV radiation until a layer of ozone (O3) forms in the upper atmosphere. The ozone layer then provides a protective barrier against UV radiation. Fluorine (F), Chlorine (Cl) and Bromine (Br) act as catalysts to breakdown ozone. They're not usually found in the upper atmosphere, but can be carried there by halohydrocarbons. Most halohydrocarbons are also super greenhouse gases. As such, halohydrocarbons should not be used when terraforming a planet. The Montreal Protocol expressly forbits the creation and/or use of many halohydrocarbons. The following is a list of halohydrocarbons know to deplete ozone:

Class I
CFC-11 CCl3F Trichlorofluoromethane
CFC-12 CCl2F2 Dichlorodifluoromethane
CFC-13 CClF3 Chlorotrifluoromethane
CFC-111 C2Cl5F Pentachlorofluoroethane
CFC-112 C2Cl4F2 Tetrachlorodifluoroethane
CFC-113 C2Cl3F3 Trichlorotrifluoroethane
CFC-114 C2Cl2F4 Dichlorotetrafluoroethane
CFC-115 C2C2F5 Chloropentafluoroethane
CFC-211 C3Cl7F3 Heptachlorofluoropropane
CFC-212 C3Cl6F2 Hexachlorodifluoropropane
CFC-213 C3Cl5F3 Pentachlorotrifluoropropane
CFC-214 C3Cl4F4 Tetrachlorotetrafluoropropane
CFC-215 C3Cl3F5 Trichloropentafluoropropane
CFC-216 C3Cl2F6 Dichlorohexafluoropropane
CFC-217 C3ClF7 Chloroheptafluoropropane
Halon 1011 CH2BrCl Bromochloromethane
Halon 1202 CBr2F2 Dibromodifluoromethane
Halon 1211 CF2ClBr Bromochlorofluoromethane
Halon 1301 CF3Br Bromotrifluoromethane
Halon 2402 C2F4Br2 Dibromotetrafluoroethane
Chloroform CCl4 Tetrachloromethane
Methyl Chloroform CHCl3 1,1,1-Trichloroethane
Methyl Bromide CH3Br Bromomethane
Class II
HCFC-21 CHFCl2
HCFC-22 CHF2Cl
HCFC-31 CH2FCl
HCFC-121 C2HFCl4
HCFC-122 C2HFCl3
HCFC-123a C2HF3Cl2
HCFC-123b CHCl2CF3
HCFC-124a C2HF4Cl
HCFC-124b CHFCLCF3
HCFC-131 C2H2FCl2
HCFC-132 C2H2F2Cl2
HCFC-133 C2H2F3HCl
HCFC-141a C2H3FCl2
HCFC-141b CH3CFCL2
HCFC-142a C2H3F2Cl
HCFC-142b CH3CF2Cl
HCFC-151 C2H4FCl
HCFC-221 C3HFCL6
HCFC-222 C3HF2CL5
HCFC-223 C3HF3Cl4
HCFC-224 C3HF4Cl3
HCFC-225 C3HF5Cl2
HCFC-225ca CF3CF2CHCL2
HCFC-225cb CF2ClCF2CHClF
HCFC-226 C3HF6Cl
HCFC-231 C3H2Cl5
HCFC-232 C3H2F2Cl4
HCFC-233 C3H2F3Cl3
HCFC-234 C3H2F4Cl2
HCFC-235 C3H2F5Cl
HCFC-241 C3H3F2Cl3
HCFC-242 C3H3F2Cl3
HCFC-243 C3H3F3Cl2
HCFC-244 C3H3F4Cl
HCFC-251 C3H4FCl3
HCFC-252 C3H4F2Cl2
HCFC-253 C3H4F3Cl
HCFC-261 C3H5FCl2
HCFC-262 C3H5F2Cl
HCFC-271 C3H6FCl