Airshed
Airshed
Airshed (pronounced: /ˈɛərˌʃɛd/) is a term used in Environmental Science and Meteorology to describe a geographical area where local topography and meteorology limit the dispersion of pollutants. The concept is closely related to the term Watershed, which describes an area of land that drains into a particular water body.
Etymology
The term 'Airshed' is a combination of the words 'air' and 'watershed'. It was first used in the 1960s to describe areas where air pollution could be trapped due to geographical and meteorological conditions.
Definition
An Airshed is typically defined as a part of the atmosphere that behaves in a coherent way with respect to the dispersion of emissions. It can be used to describe a geographical area where the air quality is influenced by the emission and dispersion of pollutants within the area.
Related Terms
- Air Pollution: The introduction of harmful substances into the Earth's atmosphere, which can cause diseases, allergies, death to humans, damage to other living organisms such as animals and food crops, or the natural or built environment.
- Atmosphere: The layer of gases surrounding a planet or other material body of sufficient mass that is held in place by the gravity of the body.
- Meteorology: The scientific study of the atmosphere that focuses on weather processes and forecasting.
- Watershed: An area or ridge of land that separates waters flowing to different rivers, basins, or seas.
External links
- Medical encyclopedia article on Airshed
- Wikipedia's article - Airshed
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