An air basin is a geographical region with commonly shared air masses, such as an area within a ring or partial ring of

mountain A mountain is an elevated portion of the Earth's crust, generally with steep sides that show significant exposed bedrock. Although definitions vary, a mountain may differ from a plateau in having a limited summit area, and is usually higher t ...

s, in which winds generally mix and stay, although air does pass in and out of basins. It describes a land area with generally similar meteorological and geographic conditions throughout.

California California () is a U.S. state, state in the Western United States that lies on the West Coast of the United States, Pacific Coast. It borders Oregon to the north, Nevada and Arizona to the east, and shares Mexico–United States border, an ...

is divided geographically into 15 air basins for the purpose of managing the air resources of the State on a regional basis.

References

{{weather-stub Atmospheric circulation