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DDOE operates an extensive 24-hour air monitoring network that measures air pollutants in the outdoor ("ambient") air and surface meteorological conditions. Monitoring data is crucial in determining compliance with EPA’s air quality standards.
The measurements support the timely reporting of air quality forecasts, sent to EPA and then onto MWCOG. It also tracks the long-term air quality to gauge the effectiveness of control and abatement strategies.
The District's air monitoring network contains monitoring stations located at the McMillan Reservoir, River Terrace Elementary School, Takoma School, Verizon Center, and Haines Point.
Each of the five station locations is sited based on population density and distribution, the location of stationary and mobile sources, and the historic concentration of particular pollutants. The air that is monitored is representative of the air that most District residents and visitors are breathing.
Each station has equipment that screens the concentration of particular pollutants in the outdoor air. DDOE visits the sites on a daily or weekly basis to perform routine data checks, performance audits, and scheduled maintenance. They also change filters and, depending on the type of sampler, retrieve raw data or achieve other quality assurance or quality control duties.
This network allows the District to conduct the following major activities and functions:
Continuous Monitoring - Real-time measurements are taken using automated sensoring equipment on an hourly basis. Measurments include:
Semi-Continuous Monitoring - Air quality samples are collected using filters or canisters, typically every day or once in every 3 or 6 days, to develop 24-hour average data. The filters are sent to a lab daily for analysis.
Data generated from this monitoring network is carefully reviewed, edited and analyzed prior to submittal into EPA's national air quality database called the Aerometric Information Retrieval System-Air Quality Subsystem (AIRS-AQS), as required under the Clean Air Act.
For more inquiries, please contact Rama Tangirala (use contact information below).