Protecting Oregon's Environment
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 Oregon Department of Environmental Quality

Air Quality

Division 266, OAR 340-266-0030


Definitions

(9) " District allocation is defined by the following identity:

District Allocation =

Maximum annual acreage limit

(Total acreage registered in the District)

X

Total acreage registered in the Valley

(49) "Ventilation Index (VI)" means a calculated value used as a criterion of atmospheric ventilation capabilities. The Ventilation Index as used in this Division is defined by the following identity:

Effective mixing height (feet)

1,000

X

Average wind speed through the effective mixing height (knots)

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For more information about Air Quality call 503-229-5359 or email.

Oregon Department of Environmental Quality
Headquarters: 811 SW Sixth Ave., Portland, OR 97204-1390
Phone: 503-229-5696 or toll free in Oregon 1-800-452-4011
Oregon Telecommunications Relay Service: 1-800-735-2900  FAX: 503-229-6124

The Oregon Department of Environmental Quality is a regulatory agency authorized to protect Oregon's environment by
the State of Oregon and the Environmental Protection Agency.

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