Two radon tests, two numbers which one counts
Two reports can say 80 and 320 without either being “wrong.” Four days versus 91. August versus January. Basement bedroom versus kitchen. Detector by a window versus the middle of the room. Closed house versus a weekend with everything open.
Health Canada compares the guideline with a long average, at least three months, ideally in winter, in the occupied area of the lowest lived-in level. That report decides mitigation. The short test serves a purchase or a first look. Do not average them on a calculator.
Read the report. 4 days or 91.
References: Health Canada, radon: what you need to know and the 200 Bq/m³ guideline. The two-year window between 200 and 600, and the one-year window above 600, come from Health Canada’s guide for radon measurements in homes.
The 4-day test is a first reading. The 91-day test covers the minimum of three months Health Canada asks for. Both are $59 before tax. Shipping, the prepaid return and the lab are included. Tax is extra. The PDF report goes out within 2 business days after the lab receives the detector.
Above 200 Bq/m³, mitigation starts with a quote. Gaz Radon is C-NRPP certified for testing and for installation, and ships kits across Canada.
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