Old Hwy 90 Air Monitoring Station, San Antonio, Texas | USA Environmental Monitoring

Old Hwy 90 is an air monitoring station located at 911 Old Hwy 90 West in San Antonio, Texas. Operated by the Texas Commission on Environmental Quality (TCEQ), it is part of the broader US EPA Air Quality System (AQS) network, which monitors ambient air quality across the United States. The station serves the Bexar County area, providing critical data on pollutant levels. The station operates under the regulatory framework of the Clean Air Act and EPA ambient air quality standards. It likely measures criteria pollutants such as ozone, particulate matter, carbon monoxide, sulfur dioxide, nitrogen dioxide, and lead, as is typical for TCEQ monitoring sites. The last sample date recorded is August 31, 2025, indicating ongoing data collection and reporting continuity. Environmental monitoring at Old Hwy 90 supports local air quality management and public health protection in the San Antonio metropolitan area. Data from this station helps assess compliance with National Ambient Air Quality Standards (NAAQS) and informs community exposure assessments. Its location along a major highway provides representative sampling of traffic-related pollution, contributing to regional air quality planning.

San Antonio's air quality is influenced by urban emissions, industrial activity, and traffic along major corridors like Interstate 10 and Highway 90. The Old Hwy 90 station's siting near a highway allows for monitoring of mobile source pollutants, which is critical for understanding local exposure patterns. Parameter coverage typically includes criteria pollutants and meteorological parameters, supporting both regulatory compliance and public health advisories.