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Maintenance and nonattainment areas 

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La Grande Air Quality Maintenance Plan

La Grande Map
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La Grande maintenance area

On June 19, 2006, EPA approved the Maintenance Plan and associated rules and EPA has changed the legal status of La Grande from nonattainment to attainment for PM10 effective July 19, 2006.


In 1991, the City of La Grande became a nonattainment area for particulate matter (PM10). Previously, DEQ established a PM10 monitor in La Grande and monitored high levels of PM10 in the airshed. The PM10 concentrations were high enough to cause a violation of the air quality standard also known as National Ambient Air Quality Standard (NAAQS). This violation meant two things. DEQ needed to write a plan to bring La Grande back into compliance with the standard. The plan needed to be approved by Environmental Protection Agency (EPA). Additionally, added restrictions would be placed on La Grande to limit new and expanding industries, and significant transportation projects would need to be reviewed to determine their compliance with the plan. The plan and rules addressing La Grande industry were prepared by DEQ in October 1991 and adopted by the Environmental Quality Commission (EQC).

The City decided to establish an Air Quality Coordinator staff person and an ongoing air quality commission to provide direction on improving the air quality in La Grande. Several projects were conducted yearly in La Grande to improve the air, including a voluntary woodstove advisory program, a public awareness program, restrictions on open burning and a school-aged children education program. Additionally, a woodstove replacement program was implemented to help low income individuals replace their uncertified woodstove. The program was successful. Ambient air quality PM10 concentrations have been reduced over the years. On February 15, 1995, EPA acknowledged that La Grande had not exceeded the standards since implementing its control strategies.

On August 11, 2005, the EQC approved a revised the State Implementation Plan including the proposed La Grande PM10 maintenance plans and supporting appendices, and adopted the associated industrial rules.

Supporting documents

[print version]

For more information about DEQ's Eastern Region call Larry Calkins at 541-278-4612 or email.

For more information about Air Quality call 503-229-5696

For reporting pollution problems contact Complaints

For technical assistance contact DEQINFO

Oregon Department of Environmental Quality
Headquarters: 700 NE Multnomah Street, Suite 600, Portland, OR 97232
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

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