Ontario - May Roberts Elementary School (OMR) Air Monitoring Station, Ontario, Oregon

Ontario - May Roberts Elementary School (OMR) is an air monitoring station located at 590 NW 8th Street in Ontario, Malheur County, Oregon, United States. It is part of the national air quality monitoring network and is operated by the Oregon Department of Environmental Quality. The station supports ambient air quality surveillance in a rural agricultural region. The station operates under the US EPA Air Quality System (AQS) framework, which sets standards for criteria pollutants such as ozone, particulate matter, carbon monoxide, sulfur dioxide, nitrogen dioxide, and lead. Monitoring stations like OMR typically measure a subset of these pollutants to assess compliance with National Ambient Air Quality Standards (NAAQS). The station's siting follows EPA guidelines to ensure representativeness of local air quality. Located in eastern Oregon near the Idaho border, the station serves a community with agricultural and light industrial activities. Continuous monitoring data from OMR helps inform local air quality management and public health advisories. The station's long-term operation supports trend analysis and regulatory reporting for the region.

The station's location in Ontario, Oregon, places it in a semi-arid region with agricultural emissions from farming and livestock. Monitoring criteria pollutants such as PM2.5 and ozone is critical due to potential impacts from agricultural burning and regional transport. The station's data contributes to the EPA's AQS database, supporting air quality assessments and public health protection.