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Radon test results



Portland Public Schools initially tested all basement and first floor classrooms in 1991 following the EPA protocol http://www.epa.gov/iaq/radon/pubs/schoolrn.html. The results of those tests and the follow-up tests during the 1991-92 school year found the overwhelming majority of the rooms below the action level of 4.0 pCi/l (picocuries per liter).

The district and private contractors have conducted three series of tests in the past year: 1) short-term testing provides school-week averages; 2) long-term testing provides averages over 6-7 months and, 3) continuous monitoring provides hour-by-hour readings. Together, they provide a comprehensive look at radon levels in each building.

In the summer of 2001, short term testing was conducted. All short-term results were below the EPA-recommended action level in all spaces that previously tested above the EPA action level.

During the 2001-2002 school year, the district followed up with long-term testing in all buildings. Much of the testing occurs at night, on weekends and over holidays when buildings are closed and ventilation is off. Radon levels tend to rise when ventilation is off.

The district then conducted continuous monitoring in every location with a long-term reading of 4 pCi/L or above. Continuous monitoring shows that levels tend to creep upwards when buildings are closed and ventilation is off which accounts for the long-term averages above 4. These hour-by-hour readings also show that when buildings are open and ventilation is on, the radon levels in classrooms drop below 4 pCi/L.

How to read this report

The following information displays the results from the 2001-02 school year and the results of any follow up tests.

From the list below, select the school you would like to view. The report displays the rooms in ascending order. Please note that if there are multiple tests for a location those results are in reverse chronological order with the most recent test first. Rooms were tested twice if they showed levels above EPA recommended action levels during the long term test.

Example report

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