St Theodosius Air Monitoring Station, Cleveland, Ohio | USA Environmental Monitoring

St Theodosius is an air monitoring station located at 2547 St Tikhon in Cleveland, Cuyahoga County, Ohio, United States. It is part of the national network of ambient air quality monitors that support the US EPA's Air Quality System (AQS), providing data on criteria pollutants such as ozone, particulate matter, carbon monoxide, sulfur dioxide, and nitrogen dioxide. The station operates under the oversight of the Ohio EPA Central Office, which manages the state's monitoring network in compliance with the Clean Air Act and National Ambient Air Quality Standards (NAAQS). The facility collects continuous or periodic samples to assess regional air quality, with the most recent sample date recorded as September 28, 2025. Typical monitoring stations in Ohio measure a range of pollutants and meteorological parameters to ensure representative siting and data continuity. As part of the broader US monitoring infrastructure, St Theodosius plays a key role in characterizing air quality in the Cleveland metropolitan area. The data supports regulatory compliance, public health advisories, and long-term trend analysis. The station's location in an urban-industrial region helps capture emissions from transportation, industry, and residential sources, contributing to informed environmental management.

The St Theodosius station is situated in Cleveland, a city with a history of heavy industry and ongoing urban air quality challenges. The monitoring site is representative of mixed residential and industrial zones, providing data on pollutant gradients. Parameter coverage typically includes criteria pollutants and may extend to speciation or meteorological parameters, depending on network design. Siting representativeness is critical for capturing population exposure and regulatory compliance under the US EPA AQS framework.