parts per million by volume of gas in air

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• Parts-per notation — One part per trillion (1 ppt) is a proportion equivalent to one twentieth of a drop of water diluted into an Olympic size swimming pool. In science and engineering, the parts per notation is a set of pseudo units to describe small values of… …   Wikipedia

• Air Quality Index — The Air Quality Index (AQI) is a standardized indicator of the air quality in a given location. It measures mainly ground level ozone and particulates (except the pollen count), but may also include sulfur dioxide, and nitrogen dioxide. Various… …   Wikipedia

• Greenhouse gas — Simple diagram of greenhouse effect. A greenhouse gas (sometimes abbreviated GHG) is a gas in an atmosphere that absorbs and emits radiation within the thermal infrared range. This process is the fundamental cause of the greenhouse effect.[1] …   Wikipedia

• Useful conversions and formulas for air dispersion modeling — Various governmental agencies involved with environmental protection and with occupational safety and health have promulgated regulations limiting the allowable concentrations of gaseous pollutants in the ambient air or in emissions to the… …   Wikipedia

• Natural gas — For other uses, see Natural gas (disambiguation). Natural gas extraction by countries in cubic meters per year. Natural gas is a naturally occurring gas mixture consisting primarily of methane, typically with 0–20% higher hydrocarbons[1] …   Wikipedia

• greenhouse gas — any of the gases whose absorption of solar radiation is responsible for the greenhouse effect, including carbon dioxide, methane, ozone, and the fluorocarbons. [1980 85] * * * ▪ atmospheric science Introduction  any gas that has the property of… …   Universalium

• Poison gas in World War I — The use of poison gas in World War I was a major military innovation. The gases ranged from disabling chemicals, such as tear gas and the severe mustard gas, to lethal agents like phosgene and chlorine. This chemical warfare was a major component …   Wikipedia

• natural gas — a combustible mixture of gaseous hydrocarbons that accumulates in porous sedimentary rocks, esp. those yielding petroleum, consisting usually of over 80 percent methane together with minor amounts of ethane, propane, butane, nitrogen, and,… …   Universalium

• Landfill gas monitoring — is the process by which gases that are released from landfill are electronically monitored.Landfill gas production results from chemical reactions and microbes acting upon the waste as the putrescible materials begins break down. [Burdekin, O.… …   Wikipedia

• gas — gasless, adj. /gas/, n., pl. gases, v., gassed, gassing. n. 1. Physics. a substance possessing perfect molecular mobility and the property of indefinite expansion, as opposed to a solid or liquid. 2. any such fluid or mixture of fluids. 3. any… …   Universalium

• Compressed natural gas — CNG redirects here. For other uses, see CNG (disambiguation). Blue diamond symbol used on CNG powered vehicles in North America …   Wikipedia