| greenhouse gas | 35.02 | Both are considered greenhouse gases. | ||
| methane gas | 7.44 | Methane gas. | ||
| petroleum gas | 4.08 | ...a truck carrying liquefied petroleum gas. | ||
| hydrogen gas | 3.36 | The ship used hydrogen gas. | ||
| chlorine gas | 3.03 | In the other, workers were exposed to chlorine gas. | ||
| sarin gas | 2.50 | Police said the substance was deadly sarin gas. | ||
| exhaust gas | 2.17 | Now the exhaust gas will contain more oxygen. | ||
| propane gas | 2.17 | Know the odor of propane gas. | ||
| cyanide gas | 1.91 | The cyanide gas also is less deadly than sarin. | ||
| dioxide gas | 1.58 | That building remains closed for cleaning with chlorine dioxide gas. | ||
| nitrogen gas | 1.58 | She spent time in a chamber of nitrogen gas to simulate altitude training. | ||
| pepper gas | 1.58 | Police sprayed pepper gas. | ||
| ethylene gas | 1.51 | The ethylene gas emitted as fruit ripens is toxic to the buds. | ||
| combustion gas | 1.18 | Another duct is installed to expel the combustion gases. | ||
| helium gas | 0.99 | This provided valuable volume to be filled with buoyant helium gas. | ||
| radon gas | 0.92 | Radon gas is not a recent discovery. | ||
| sewer gas | 0.79 | You have eliminated sewer gas and animals. | ||
| argon gas | 0.66 | The ratios change over time as potassium undergoes radioactive Decay and emits argon gas. | ||
| oxygen gas | 0.66 | Ozone is a highly reactive form of oxygen gas. | ||
| ozone gas | 0.59 | Ozone gas is generated by vehicles and agricultural equipment. |