John Ondov New Supersite at MTA Employee Parking Lot - Baltimore Air Monitoring Station

John Ondov New Supersite at MTA Employee Parking Lot is an operational air monitoring station located at 299 Ponca Street in Baltimore, Maryland, United States. The facility is operated by the Maryland Department of the Environment and contributes to the national ambient air quality monitoring network. As part of the US EPA Air Quality System (AQS), this station measures criteria pollutants and other atmospheric parameters to ensure compliance with National Ambient Air Quality Standards (NAAQS). The station's siting in an urban area provides representative data for population exposure assessment. The station supports public health protection by providing real-time air quality data used for regulatory decisions and public advisories. Its location near transportation infrastructure helps characterize urban air pollution sources and trends.

Baltimore's air quality is influenced by industrial emissions, vehicle traffic, and regional transport. The John Ondov New Supersite monitors criteria pollutants such as ozone, particulate matter, and nitrogen dioxide, which are regulated under the Clean Air Act. Data from this station supports the Maryland Department of the Environment's air quality management and public health advisories.