| Inbound Relationships | Type | Active | Source | Characteristic | Refinability | Group | 
| Insufflation of fallopian tube using gas | Direct substance | False | Gaseous substance | Inferred relationship | Some |  | 
| Injection of gas | Direct substance | True | Gaseous substance | Inferred relationship | Some | 1 | 
| Pneumatic vitreolysis | Direct substance | True | Gaseous substance | Inferred relationship | Some | 1 | 
| Gas mixture | Is a | True | Gaseous substance | Inferred relationship | Some |  | 
| Breath | Is a | True | Gaseous substance | Inferred relationship | Some |  | 
| Injury due to legal intervention by gas | Causative agent | True | Gaseous substance | Inferred relationship | Some | 2 | 
| Injury due to legal intervention by tear gas | Causative agent | True | Gaseous substance | Inferred relationship | Some | 2 | 
| Injury due to legal intervention by poisoning by gas | Causative agent | True | Gaseous substance | Inferred relationship | Some | 2 | 
| Injury due to legal intervention by asphyxiation by gas | Causative agent | True | Gaseous substance | Inferred relationship | Some | 2 | 
| Self poisoning by gas | Causative agent | True | Gaseous substance | Inferred relationship | Some | 1 | 
| Suicide and selfinflicted poisoning by gases in domestic use | Causative agent | True | Gaseous substance | Inferred relationship | Some | 2 | 
| Suicide and selfinflicted poisoning by gas distributed by pipeline | Causative agent | True | Gaseous substance | Inferred relationship | Some | 2 | 
| Suicide and selfinflicted poisoning by liquefied petroleum gas distributed in mobile containers | Causative agent | True | Gaseous substance | Inferred relationship | Some | 2 | 
| Alkane | Is a | True | Gaseous substance | Inferred relationship | Some |  | 
| Poisoning caused by gaseous substance | Causative agent | True | Gaseous substance | Inferred relationship | Some | 1 | 
| Hydrocarbon gas | Is a | True | Gaseous substance | Inferred relationship | Some |  | 
| Radioactive gas | Is a | True | Gaseous substance | Inferred relationship | Some |  | 
| Blood gas | Is a | True | Gaseous substance | Inferred relationship | Some |  | 
| Air | Is a | True | Gaseous substance | Inferred relationship | Some |  | 
| Toxic effect of bromobenzyl cyanide | Causative agent | False | Gaseous substance | Inferred relationship | Some |  | 
| Toxic effect of lacrimogenic gas | Causative agent | False | Gaseous substance | Inferred relationship | Some |  | 
| Toxic effect of ethyliodoacetate | Causative agent | False | Gaseous substance | Inferred relationship | Some |  | 
| Lacrimogenic gas causing toxic effect NOS | Causative agent | False | Gaseous substance | Inferred relationship | Some |  | 
| War gas | Is a | False | Gaseous substance | Inferred relationship | Some |  | 
| Gaseous material specimen | Specimen substance | True | Gaseous substance | Inferred relationship | Some | 1 | 
| Natural gas | Is a | True | Gaseous substance | Inferred relationship | Some |  | 
| Steam | Is a | True | Gaseous substance | Inferred relationship | Some |  | 
| Intestinal gas | Is a | True | Gaseous substance | Inferred relationship | Some |  | 
| Manufactured gas | Is a | True | Gaseous substance | Inferred relationship | Some |  | 
| Gas poisoning -accident | Causative agent | False | Gaseous substance | Inferred relationship | Some |  | 
| Smoke | Is a | True | Gaseous substance | Inferred relationship | Some |  | 
| Intestinal gas | Is a | False | Gaseous substance | Inferred relationship | Some |  | 
| War injury due to gas | Causative agent | True | Gaseous substance | Inferred relationship | Some | 2 | 
| Chemical fumes | Is a | False | Gaseous substance | Inferred relationship | Some |  | 
| Medical gas | Is a | False | Gaseous substance | Inferred relationship | Some |  | 
| Toxic effect of chloroacetophenone | Causative agent | False | Gaseous substance | Inferred relationship | Some |  | 
| Accidental carbon monoxide poisoning | Causative agent | False | Gaseous substance | Inferred relationship | Some | 1 | 
| Carboxyhaemoglobinaemia | Causative agent | False | Gaseous substance | Inferred relationship | Some | 1 | 
| Chronic carbon monoxide intoxication | Causative agent | False | Gaseous substance | Inferred relationship | Some | 1 | 
| Carbon monoxide poisoning | Causative agent | False | Gaseous substance | Inferred relationship | Some | 2 | 
| Sulfur dioxide poisoning | Causative agent | False | Gaseous substance | Inferred relationship | Some |  | 
| Toxic effect of phosgene | Causative agent | False | Gaseous substance | Inferred relationship | Some |  | 
| Toxic effect of bromobenzyl cyanide | Causative agent | False | Gaseous substance | Inferred relationship | Some |  | 
| Oxygen poisoning | Causative agent | False | Gaseous substance | Inferred relationship | Some |  | 
| Toxic effect of hydrocyanic acid gas | Causative agent | False | Gaseous substance | Inferred relationship | Some |  | 
| Toxic effect of nitrogen oxide | Causative agent | False | Gaseous substance | Inferred relationship | Some |  | 
| Toxic effect of gas, fumes AND/OR vapours | Causative agent | False | Gaseous substance | Inferred relationship | Some | 1 | 
| Toxic effect of nitrogen dioxide | Causative agent | False | Gaseous substance | Inferred relationship | Some |  | 
| Toxic effect of brass fumes | Causative agent | False | Gaseous substance | Inferred relationship | Some |  | 
| Toxic effect of freon | Causative agent | False | Gaseous substance | Inferred relationship | Some |  | 
| Arsine poisoning | Causative agent | False | Gaseous substance | Inferred relationship | Some |  | 
| Toxic effect of lacrimogenic gas | Causative agent | False | Gaseous substance | Inferred relationship | Some |  | 
| Toxic effect of ethyliodoacetate | Causative agent | False | Gaseous substance | Inferred relationship | Some |  | 
| Toxic effect of chlorine gas | Causative agent | False | Gaseous substance | Inferred relationship | Some |  | 
| Carbon monoxide poisoning from motor vehicle exhaust | Causative agent | False | Gaseous substance | Inferred relationship | Some | 1 | 
| Carbon monoxide poisoning from faulty furnace AND/OR heater | Causative agent | False | Gaseous substance | Inferred relationship | Some | 1 | 
| Carbon monoxide poisoning from fire | Causative agent | False | Gaseous substance | Inferred relationship | Some | 1 | 
| Toxic effect of fluorine gas and hydrogen fluoride | Causative agent | False | Gaseous substance | Inferred relationship | Some |  | 
| Toxic effect of hydrogen sulfide | Causative agent | False | Gaseous substance | Inferred relationship | Some |  | 
| Toxic effect of carbon dioxide | Causative agent | False | Gaseous substance | Inferred relationship | Some | 2 | 
| Poisoning by carbon monoxide from aircraft whilst in transit, without accident to aircraft | Causative agent | False | Gaseous substance | Inferred relationship | Some | 2 | 
| Poisoning by carbon monoxide from aircraft whilst in transit, without accident to aircraft, occupant of spacecraft injured | Causative agent | False | Gaseous substance | Inferred relationship | Some |  | 
| Poisoning caused by carbon monoxide from aircraft while in transit, without accident to aircraft, occupant of military aircraft injured | Causative agent | False | Gaseous substance | Inferred relationship | Some | 1 | 
| Poisoning by carbon monoxide from aircraft whilst in transit, without accident to aircraft, member of crew of commercial aircraft in surface to surface transport injured | Causative agent | False | Gaseous substance | Inferred relationship | Some | 1 | 
| Poisoning by carbon monoxide from aircraft whilst in transit, without accident to aircraft, occupant of commercial aircraft in surface to air transport injured | Causative agent | False | Gaseous substance | Inferred relationship | Some | 1 | 
| Poisoning by carbon monoxide from aircraft whilst in transit, without accident to aircraft, occupant of unpowered aircraft, except parachutist, injured | Causative agent | False | Gaseous substance | Inferred relationship | Some | 1 | 
| Poisoning caused by carbon monoxide from aircraft while in transit, without accident to aircraft, parachutist injured | Causative agent | False | Gaseous substance | Inferred relationship | Some | 1 | 
| Poisoning by carbon monoxide from aircraft whilst in transit, without accident to aircraft, member of ground crew or airline employee injured | Causative agent | False | Gaseous substance | Inferred relationship | Some | 1 | 
| Accidental brass fumes poisoning | Causative agent | False | Gaseous substance | Inferred relationship | Some |  | 
| Accidental poisoning by carbon monoxide from incomplete combustion of coal in domestic stove or fireplace | Causative agent | False | Gaseous substance | Inferred relationship | Some | 1 | 
| Accidental poisoning by carbon monoxide from incomplete combustion of coke in domestic stove or fireplace | Causative agent | False | Gaseous substance | Inferred relationship | Some | 1 | 
| Accidental poisoning by carbon monoxide from incomplete combustion of wood in domestic stove or fireplace | Causative agent | False | Gaseous substance | Inferred relationship | Some | 1 | 
| Accidental poisoning by carbon monoxide from incomplete combustion of kerosene or paraffin in domestic stove or fireplace | Causative agent | False | Gaseous substance | Inferred relationship | Some | 1 | 
| Accidental poisoning by carbon monoxide from blast furnace gas | Causative agent | False | Gaseous substance | Inferred relationship | Some | 1 | 
| Accidental poisoning by carbon monoxide from kiln vapour | Causative agent | False | Gaseous substance | Inferred relationship | Some | 1 | 
| Accidental poisoning by carbon monoxide from incomplete combustion of fuels in industrial use | Causative agent | False | Gaseous substance | Inferred relationship | Some | 1 | 
| Accidental nitrogen oxide poisoning | Causative agent | False | Gaseous substance | Inferred relationship | Some |  | 
| Accidental sulfur dioxide poisoning | Causative agent | False | Gaseous substance | Inferred relationship | Some |  | 
| Accidental freon poisoning | Causative agent | False | Gaseous substance | Inferred relationship | Some |  | 
| Accidental tear gas poisoning | Causative agent | False | Gaseous substance | Inferred relationship | Some |  | 
| Accidental bromobenzyl cyanide poisoning | Causative agent | False | Gaseous substance | Inferred relationship | Some |  | 
| Accidental chloroacetophenone poisoning | Causative agent | False | Gaseous substance | Inferred relationship | Some |  | 
| Accidental ethyliodoacetate poisoning | Causative agent | False | Gaseous substance | Inferred relationship | Some |  | 
| Accidental hydrocyanic acid gas poisoning | Causative agent | False | Gaseous substance | Inferred relationship | Some |  | 
| Self poisoning by motor vehicle exhaust gas | Causative agent | False | Gaseous substance | Inferred relationship | Some | 1 | 
| Self poisoning by carbon monoxide | Causative agent | False | Gaseous substance | Inferred relationship | Some | 1 | 
| Self poisoning by coal gas | Causative agent | False | Gaseous substance | Inferred relationship | Some | 1 | 
| Nitrogen oxides causing toxic effect NOS | Causative agent | False | Gaseous substance | Inferred relationship | Some |  | 
| Lacrimogenic gas causing toxic effect NOS | Causative agent | False | Gaseous substance | Inferred relationship | Some |  | 
| Other gas, fume or vapour causing toxic effect | Causative agent | False | Gaseous substance | Inferred relationship | Some |  | 
| Other gas, fume and vapour causing toxic effect NOS | Causative agent | False | Gaseous substance | Inferred relationship | Some |  | 
| [X]Toxic effects of other specified gases, fumes and vapours | Causative agent | False | Gaseous substance | Inferred relationship | Some |  | 
| Poisoning by carbon monoxide from aircraft whilst in transit, without accident to aircraft, other occupant of commercial aircraft in surface to surface transport injured | Causative agent | False | Gaseous substance | Inferred relationship | Some |  | 
| Poisoning by carbon monoxide from aircraft whilst in transit, without accident to aircraft, occupant of other powered aircraft injured | Causative agent | False | Gaseous substance | Inferred relationship | Some |  | 
| Poisoning by carbon monoxide from aircraft whilst in transit, without accident to aircraft, other person injured | Causative agent | False | Gaseous substance | Inferred relationship | Some |  | 
| Accidental poisoning by carbon monoxide from other sources | Causative agent | False | Gaseous substance | Inferred relationship | Some |  | 
| Accidental poisoning by carbon monoxide from other source NOS | Causative agent | False | Gaseous substance | Inferred relationship | Some |  | 
| Accidental poisoning by carbon monoxide NOS | Causative agent | False | Gaseous substance | Inferred relationship | Some |  | 
| Accidental poisoning by tear gas NOS | Causative agent | False | Gaseous substance | Inferred relationship | Some |  | 
| Gases, fumes or vapours causing toxic effect NOS | Causative agent | False | Gaseous substance | Inferred relationship | Some |  | 
| Gas/fume NOS - toxic effect | Causative agent | False | Gaseous substance | Inferred relationship | Some |  |