Overview
Ontario Near Road (Etiwanda) is an air monitoring station in Ontario, California, operated by the South Coast Air Quality Management District as part of the NEAR ROAD network. It monitors criteria pollutants and air quality near Interstate 10.
Ontario Near Road (Etiwanda) is an air monitoring station located at the northwest corner of Interstate 10 and Etiwanda Avenue in Ontario, California. It is part of the NEAR ROAD network, which focuses on measuring air quality near major roadways to assess traffic-related pollution. The station is operated by the South Coast Air Quality Management District (SCAQMD), the regulatory agency responsible for air quality in the South Coast Air Basin. The station operates under the U.S. EPA's Air Quality System (AQS) framework, which sets standards for criteria pollutants such as ozone, particulate matter, carbon monoxide, nitrogen dioxide, and sulfur dioxide. As a near-road monitor, it provides data on pollutant concentrations in close proximity to a major highway, helping to evaluate exposure for nearby populations and inform regulatory actions. The station's last reported sample date is September 30, 2025, indicating ongoing operation. This monitoring station plays a critical role in understanding the impact of vehicular emissions on local air quality in the San Bernardino County region. The data collected supports public health assessments, compliance with National Ambient Air Quality Standards (NAAQS), and the development of emission reduction strategies. Its location near Interstate 10 makes it particularly valuable for studying traffic-related air pollution in a densely populated area.
Environmental context
The station's location near Interstate 10 in Ontario, California, places it in a region with high traffic density, contributing to elevated levels of nitrogen oxides and particulate matter. The South Coast Air Basin faces challenges with ozone and PM2.5 non-attainment, making near-road monitoring essential for understanding local exposure patterns. The station's data supports the SCAQMD's efforts to meet EPA standards and protect public health.
Frequently asked questions
The station is located at the northwest corner of Interstate 10 and Etiwanda Avenue in Ontario, California, USA.
As a near-road monitoring station, it typically measures criteria pollutants such as ozone, particulate matter, nitrogen dioxide, carbon monoxide, and sulfur dioxide, as part of the EPA's AQS network.
The station is operated by the South Coast Air Quality Management District (SCAQMD), the local regulatory agency for air quality in the South Coast Air Basin.
Near-road stations measure air quality close to major highways to assess traffic-related pollution exposure and support compliance with National Ambient Air Quality Standards (NAAQS).
Data from the station helps SCAQMD evaluate emission impacts, develop control strategies, and inform the public about local air quality, supporting EPA regulatory frameworks.
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