White Mountain Air Monitoring Station, Ruidoso, New Mexico | IMPROVE Network

White Mountain is an air monitoring station located in Ruidoso, Lincoln County, New Mexico, United States. It operates as part of the Interagency Monitoring of Protected Visual Environments (IMPROVE) network, a collaborative program focused on assessing visibility impairment in scenic areas. The station is operated by the National Park Service and is currently operational, with its most recent sample collected in February 2025. The IMPROVE network employs specialized instrumentation to measure fine particulate matter (PM2.5) and its chemical components, including sulfates, nitrates, organic carbon, and elemental carbon. These measurements support the Regional Haze Rule under the US EPA's Air Quality System (AQS) framework, which aims to improve visibility in national parks and wilderness areas. The station's siting in the Sacramento Mountains provides representative data for regional air quality assessments. As part of a national network of over 160 sites, White Mountain contributes to long-term trends in visibility and particulate pollution. Its data informs regulatory decisions and public health advisories for the surrounding region, including the Lincoln National Forest. The station's continuous operation supports the EPA's goal of reducing regional haze and protecting natural visibility conditions.

The White Mountain station is situated in a forested, mountainous region of southern New Mexico, an area influenced by both local emissions (wildfires, prescribed burns) and transported pollutants from urban and industrial sources. The IMPROVE network focuses on visibility and fine particulate speciation, which are critical for understanding regional haze and its ecological impacts. The station's data helps track compliance with the Regional Haze Rule and supports the EPA's AQS monitoring framework.